Preceding 7 Days
From 19 Mar 2026 0:03:51 to 25 Mar 2026 23:59:31
| Page | Total | | LSU | | Outside | |
AI-A, | (Bot? ) | (AI-C ) |
|---|
| /seminar/ sem_insert_fierce.js | 400 | = | 25 | + | 375 | + | 0, | ( 50) | ( 1) |
| /lsu-cms/ ece-mc-css-main.js | 394 | = | 25 | + | 369 | + | 0, | ( 53) | ( 3) |
| / 4720 | 240 | = | 23 | + | 217 | + | 0, | ( 24) | ( 0) |
| /kak/ taj.pdf | 194 | = | 0 | + | 152 | + | 42, | ( 64) | ( 3) |
| /ee4720/ 4720hp.svg | 184 | = | 17 | + | 167 | + | 0, | ( 8) | ( 2) |
| /kak/ GarbhaUpanishad.pdf | 184 | = | 0 | + | 165 | + | 19, | ( 53) | ( 14) |
| /kak/ zoro.pdf | 172 | = | 0 | + | 129 | + | 43, | ( 57) | ( 7) |
| /gp/notes/ set-nv-org.pdf | 152 | = | 0 | + | 61 | + | 91, | ( 88) | ( 3) |
| /fac/ faculty-az-insert-fierce.js | 147 | = | 14 | + | 133 | + | 0, | ( 8) | ( 0) |
| /kak/ MahabharataII.pdf | 142 | = | 0 | + | 113 | + | 29, | ( 126) | ( 1) |
| /ipl/papers/ IEEE_SPM2005.pdf | 119 | = | 0 | + | 64 | + | 55, | ( 56) | ( 2) |
| /4720/ prev.html | 115 | = | 13 | + | 100 | + | 2, | ( 28) | ( 0) |
| /vaidy/WCCC/ Keynote.pptx | 102 | = | 0 | + | 102 | + | 0, | ( 2) | ( 0) |
| / koppel | 100 | = | 5 | + | 95 | + | 0, | ( 12) | ( 2) |
| / xinli | 95 | = | 0 | + | 93 | + | 2, | ( 18) | ( 4) |
| /ee4720/ grades.html | 80 | = | 6 | + | 74 | + | 0, | ( 6) | ( 0) |
| /lsu-cms/ ece-mc-lab-index.js | 80 | = | 0 | + | 80 | + | 0, | ( 21) | ( 0) |
| /ugrad/ advising-form.pdf | 78 | = | 30 | + | 47 | + | 1, | ( 8) | ( 0) |
| /ee4720/2026/ mtrnk.svg | 77 | = | 6 | + | 71 | + | 0, | ( 3) | ( 1) |
| /kak/ ast.pdf | 74 | = | 0 | + | 54 | + | 20, | ( 136) | ( 5) |
| /mcu/lawss/add_materials/FaultDetectionPart3.pdf | 71 | = | 0 | + | 24 | + | 47, | ( 63) | ( 0) |
| /tca/papers/ vanderwiel-00.pdf | 71 | = | 0 | + | 48 | + | 23, | ( 51) | ( 8) |
| /ee3755/2013f/ cla.pdf | 69 | = | 0 | + | 48 | + | 21, | ( 86) | ( 7) |
| /ee4720/doc/ i64-ia32-basic-arch.pdf | 67 | = | 0 | + | 17 | + | 50, | ( 141) | ( 2) |
| /ee4720/doc/ riscv-bitmanip-1.0.0.pdf | 63 | = | 0 | + | 42 | + | 21, | ( 93) | ( 8) |
| /ugrad/elective-courses-planned-fa-26.pdf | 60 | = | 20 | + | 40 | + | 0, | ( 8) | ( 4) |
| /jxr/pohll-02/talks/bernholdt_talk.ppt | 59 | = | 0 | + | 59 | + | 0, | ( 0) | ( 1) |
| /kak/ Time2.pdf | 58 | = | 0 | + | 47 | + | 11, | ( 47) | ( 1) |
| /kak/ ang3.pdf | 58 | = | 0 | + | 36 | + | 22, | ( 29) | ( 2) |
| /seminar/ index-insert.js | 57 | = | 0 | + | 57 | + | 0, | ( 11) | ( 0) |
| /alex/EE2720/ EE2720_HO9.pdf | 56 | = | 0 | + | 54 | + | 2, | ( 1) | ( 0) |
| /ee4720/2025/ mt_sol.pdf | 54 | = | 7 | + | 45 | + | 2, | ( 6) | ( 0) |
| /kak/ shiva.pdf | 54 | = | 0 | + | 32 | + | 22, | ( 11) | ( 1) |
| /kemin/ robust.htm | 54 | = | 0 | + | 25 | + | 29, | ( 89) | ( 0) |
| /lpeng/papers/ isast08.pdf | 53 | = | 0 | + | 35 | + | 18, | ( 17) | ( 1) |
| /lsu-cms/ ece-mc-css-misc.js | 53 | = | 0 | + | 53 | + | 0, | ( 9) | ( 0) |
| /ugrad/elective-courses-planned-sp-26.pdf | 52 | = | 20 | + | 31 | + | 1, | ( 5) | ( 7) |
| /gp/refs/ GLSLangSpec.4.60.pdf | 51 | = | 0 | + | 22 | + | 29, | ( 136) | ( 0) |
| /kak/ Akhenaten.pdf | 50 | = | 0 | + | 35 | + | 15, | ( 14) | ( 0) |
| /kak/ bhate.pdf | 50 | = | 0 | + | 44 | + | 6, | ( 28) | ( 2) |
| /lsu-cms/ ece-mc-labs.js | 50 | = | 1 | + | 49 | + | 0, | ( 19) | ( 0) |
| /kak/ EarlyArchitecture.pdf | 49 | = | 0 | + | 40 | + | 9, | ( 27) | ( 0) |
| /ee4720/1997/ lsli10.html | 48 | = | 0 | + | 45 | + | 3, | ( 18) | ( 1) |
| /kak/ a3.pdf | 48 | = | 0 | + | 35 | + | 13, | ( 26) | ( 4) |
| /xinli/assets/js/ jquery.lazyload.js | 48 | = | 0 | + | 48 | + | 0, | ( 5) | ( 0) |
| /ee4720/ sam.pdf | 47 | = | 0 | + | 26 | + | 21, | ( 63) | ( 8) |
| /kak/ KAKThePaninianApproach.pdf | 47 | = | 0 | + | 32 | + | 15, | ( 21) | ( 3) |
| /xinli/assets/js/ bootstrap.min.js | 47 | = | 0 | + | 47 | + | 0, | ( 5) | ( 0) |
| /gunturk/EE7700/ Eigenface.pdf | 46 | = | 0 | + | 11 | + | 35, | ( 41) | ( 1) |
| /kak/ binary.pdf | 46 | = | 0 | + | 43 | + | 3, | ( 16) | ( 9) |
| Totals: | 15070 | | 714 | | 14356 | |
2254, | (31228 ) | 12053, |
|---|
| Distinct Hosts: | 0 | | 0 | | 0 | |
-1, | (2521 ) | ( -1 ) |
|---|
A category is chosen using these tests applied in order:
"Bot?", Hit from the same host requested robots.txt. (As Web indexers do.)
"LSU", Host name matches Perl regular expression \.lsu\.edu$.
"Outside", Any host name.
|
Browsers and other User Agents |
All Brwsrs Brand : Version Pct, ...
51.38% 69.85% Chrome : 146.0.0.0 29.3%, 142.0.x 13.5%, 145.0.x 6.5%,
: 135.0.x 4.8%, 143.0.x 4.7%, 120.0x 3.4%,
: 139.0.0.0 3.2%, 144.0.0.0 3.0%,
: 89.0.43x 2.4%, 131.0.x 1.9%, 129.0.x 1.6%.
: Android 6.7%, Linux 2.6%, Macintosh 39.4%,
: Unknown 0.4%, Windows 50.9%.
16.35% 22.23% Safari : 537.36 40.9%, 605.1.15x 25.4%, 604.1x 24.3%,
: 601.2.4 facebookexternalhit/1.1 Facebot Twitterbot/1.0 2.5%,
: 10600.6.3 1.8%, 184.1 0.3%, 616.2 0.2%,
: 616.3 0.1%, 617.6 0.1%, 618.1 0.1%,
: 619.8 0.1%.
: Android 36.8%, Macintosh 30.9%, Unknown 6.3%,
: Windows 0.6%, iPad 1.0%, iPhone 23.9%,
: iPod 0.6%.
13.00% ChatGPT-User
4.85% 6.60% Firefox : 148.0 59.8%, 147.0 6.8%, 111.0 3.0%,
: 128.0 2.1%, 115.0 2.0%, 140.0 2.0%,
: 125.0 1.4%, 136.0 1.3%, 3.6.12 1.3%,
: 138.0 1.3%, 150.0 1.3%.
: Android 4.4%, Linux 37.4%, Macintosh 7.4%,
: Windows 50.8%.
2.44% python-requests: 2.32.5 99.8%, 2.32.4 0.2%.
: Unknown 100.0%.
2.26% Python : 3.12 aiohttp/3.12.12 99.0%,
: 3.12 aiohttp/3.13.3 1.0%.
: Unknown 100.0%.
2.04% Sogou web spider/4.0
1.48% YisouSpider
0.92% Wget : 1.20.3 89.4%, 1.21.x 10.6%.
: Unknown 100.0%.
0.77% Baiduspider-render/2.0
Notes: MSIE refers to Microsoft Internet Explorer, Netscape refers
to Netscape Navigator, SeaMonkey refers to SeaMonkey and to older
versions (called the Mozilla Suite). Firefox
refers to Mozilla Firefox and to older versions (Mozilla Firebird,
Firebird™ and Phoenix). All shows the percentage of
accesses using the corresponding user agent, Brwsrs only counts
recognized web browsers. A version ending in x refers to
multiple sub-versions.
|
Accesses by Possible Crawlers |
Visits Crawler
10154 meta-externalagent
3280 bingbot
3020 Googlebot
1379 ClaudeBot
1351 googlebot.com
1244 petalsearch.com
997 semrush.com
|
Most Frequently Visiting Domains |
Visits Hosts Originating Domain
1279 229 amazonaws.com
544 260 googlezip.net
519 45 googleusercontent.com
488 80 cox.net
410 87 20.169.78
387 1 mikegpts-XXX.lsu.edu
307 227 sogou.com
303 88 sbcglobal.net
285 1 188.72.107
253 189 baidu.com
191 170 apple.com
170 68 20.215.220
143 44 wlan.lsu.edu
140 102 comcast.net
137 102 spectrum.com
|
Most Frequently Visiting Countries or Groups |
Visits Hosts Originating Country or Group
10712 5893 Unknown Origin
3314 1349 com - Commercial
2024 858 net - Network Provider
764 102 edu - Educational
57 45 de - Germany
53 52 br - Brazil
35 35 in - India
30 10 ru - Russia
29 23 cn - People's Republic of China
16 10 nl - Netherlands
12 9 mx - Mexico
11 4 tw - Taiwan
11 10 tr - Turkey
11 11 fr - France
10 9 pl - Poland
Omitted promotional referrers: 303, promoted urls: 51.
|
Most Frequently Used Search Engines |
Visits Via Search Engine
28 www.google.com
1 scholar.google.com
|
Most Frequently Used Search Strings |
#e #s #p Visits Using Search Strings... ...Found Page (Most Visits)
1 1 1 5 https://www.ece.lsu.edu/ee4720/ /4720
1 1 1 5 https://www.ece.lsu.edu/kak/taj.pdf /kak/taj.pdf
1 1 1 4 https://www.ece.lsu.edu/kak/GarbhaUpanishad.pdf/kak/GarbhaUpanishad.pdf
1 1 1 2 https://www.ece.lsu.edu/kak/zoro.pdf /kak/zoro.pdf
1 1 1 2 https://www.ece.lsu.edu/trahan/ /trahan
1 1 1 1 carbon dating of taj mahal /kak/taj.pdf
1 1 1 1 https://www.ece.lsu.edu/ee4720/2021/mt_sol.pdf/ee4720/2021/mt_sol.pdf
1 1 1 1 https://www.ece.lsu.edu/ee4720/guides.html/ee4720/guides.html
1 1 1 1 https://www.ece.lsu.edu/kak/ast.pdf /kak/ast.pdf
1 1 1 1 https://www.ece.lsu.edu/kak/cons.pdf /kak/cons.pdf
1 1 1 1 https://www.ece.lsu.edu/kak/shruti.pdf /kak/shruti.pdf
1 1 1 1 https://www.ece.lsu.edu/koppel/ /koppel
1 1 1 1 https://www.ece.lsu.edu/koppel/gpup/ /koppel/gpup
1 1 1 1 https://www.ece.lsu.edu/koppel/koppel.html/koppel
1 1 1 1 https://www.ece.lsu.edu/oloughlin/ /oloughlin
1 1 1 1 types displacement sensors and application pdf/ee4770/1998/lsli09.4up.pdf
#e: Number of different search engines used, link is to the most
common engine.
#s: Number of search strings the line actually reports
on. For example, if the #s entry were 5 and the string shown were "Computers"
the line might report on search strings "Computers", "Computer", "+Computers",
"COMPUTERS", and even "-computers".
#p: Number of distinct pages that
were visited, the one with the most visits from
the string is shown.
From 19 Mar 2026 0:02:45 to 25 Mar 2026 21:13:05
| Page | Total | | LSU | | Outside | |
AI-A, | (Bot? ) | (AI-C ) |
|---|
| /v/s/ genus_attref.pdf | 9 | = | 1 | + | 8 | + | 0, | ( 4) | ( 0) |
| /koppel/gp/srefs/ keckler-echelon.pdf | 7 | = | 0 | + | 7 | + | 0, | ( 2) | ( 0) |
| /v/s/ genus_user.pdf | 7 | = | 0 | + | 7 | + | 0, | ( 5) | ( 1) |
| /gp/srefs/ R5xx_Acceleration_v1.2.pdf | 6 | = | 0 | + | 6 | + | 0, | ( 1) | ( 0) |
| /gp/srefs/ p830-villa.pdf | 6 | = | 1 | + | 5 | + | 0, | ( 1) | ( 0) |
| /koppel/gp/srefs/ p130-kim.pdf | 6 | = | 0 | + | 6 | + | 0, | ( 0) | ( 0) |
| /koppel/gp/srefs/ p451-lee.pdf | 5 | = | 0 | + | 5 | + | 0, | ( 0) | ( 1) |
| /suresh/hw4710/ set6.pdf | 5 | = | 0 | + | 5 | + | 0, | ( 8) | ( 0) |
| Totals: | 142 | | 3 | | 139 | |
0, | ( 106 ) | 24, |
|---|
| Distinct Hosts: | 0 | | 0 | | 0 | |
-1, | ( 61 ) | ( -1 ) |
|---|
A category is chosen using these tests applied in order:
"Bot?", Hit from the same host requested robots.txt. (As Web indexers do.)
"LSU", Host name matches Perl regular expression \.lsu\.edu$.
"Outside", Any host name.
|
Browsers and other User Agents |
All Brwsrs Brand : Version Pct, ...
53.52% 57.14% Chrome : 135.0.0.0 39.5%, 136.0.0.0 23.7%,
: 134.0.0.0 13.2%, 144.0.0.0 7.9%,
: 129.0.0.0 6.6%, 142.0.0.0 2.6%,
: 133.0.0.0 2.6%, 146.0.0.0 1.3%,
: 119.0.0.0 1.3%, 123.0.0.0 1.3%.
: Macintosh 42.1%, Windows 57.9%.
38.73% 41.35% Safari/537.36
4.93% Sogou web spider/4.0
1.41% 1.50% Firefox : 135.0 50.0%, 148.0 50.0%.
: Linux 50.0%, Macintosh 50.0%.
1.41% Baiduspider/2.0
Notes: MSIE refers to Microsoft Internet Explorer, Netscape refers
to Netscape Navigator, SeaMonkey refers to SeaMonkey and to older
versions (called the Mozilla Suite). Firefox
refers to Mozilla Firefox and to older versions (Mozilla Firebird,
Firebird™ and Phoenix). All shows the percentage of
accesses using the corresponding user agent, Brwsrs only counts
recognized web browsers. A version ending in x refers to
multiple sub-versions.
|
Most Frequently Visiting Domains |
Denys Hosts Originating Domain
55 38 amazonaws.com
13 12 sogou.com
4 4 143.14.6
3 3 207.180.11
3 1 ece.lsu.edu
2 2 144.31.35
2 2 baidu.com
2 2 163data.com.cn
1 1 112.2.79
1 1 172.252.134
|
Most Frequently Visiting Countries or Groups |
Denys Hosts Originating Country or Group
70 52 com - Commercial
59 59 Unknown Origin
3 1 edu - Educational
2 2 net - Network Provider
2 2 ar - Argentina
2 2 cn - People's Republic of China
2 2 br - Brazil
1 1 za - South Africa
1 1 it - Italy
|
Most Frequently Likely Referring Hosts |
Lnks Denys ...From Links on Host Most Common Linking Page and Target
2 9 www.ece.lsu.edu 6 From → /ee4720/s/yeager96.pdf
Omitted promotional referrers: 0 promoted urls: 0
|
Most Frequently Used Search Strings |
#e #s #p Denys Using Search Strings... ...Found Page (Most Denys)
Status Codes (Access Outcomes)
Count Code Description
248 401 Unauthorized.
From 19 Mar 2026 0:05:43 to 25 Mar 2026 23:54:07
| Page | Total | | LSU | | Outside | |
AI-A, | (Bot? ) | (AI-C ) |
|---|
| / wp-login.php | 511 | = | 0 | + | 511 | + | 0, | ( 6) | ( 0) |
| / administrator | 316 | = | 0 | + | 316 | + | 0, | ( 2) | ( 0) |
| / www.ece.lsu.edu | 136 | = | 0 | + | 136 | + | 0, | ( 37) | ( 0) |
| /.well-known/ traffic-advice | 110 | = | 0 | + | 110 | + | 0, | ( 10) | ( 0) |
| /news/2008/ ececonnectionfall2008.pdf | 62 | = | 0 | + | 62 | + | 0, | ( 0) | ( 0) |
| /lpeng/ wp-login.php | 45 | = | 0 | + | 45 | + | 0, | ( 0) | ( 0) |
| /lpeng/ wordpress | 32 | = | 0 | + | 32 | + | 0, | ( 2) | ( 12) |
| /eng/ ece | 29 | = | 0 | + | 29 | + | 0, | ( 196) | ( 0) |
| /smehraeen/Assets/js/javascript.js | 27 | = | 0 | + | 27 | + | 0, | ( 5) | ( 0) |
| /smehraeen/Assets/js/jquery.pngFix.pack.js | 27 | = | 0 | + | 27 | + | 0, | ( 5) | ( 0) |
| /cgi-bin/../../../../../../../../../../bin/sh | 26 | = | 0 | + | 26 | + | 0, | ( 0) | ( 0) |
| /smehraeen/Assets/js/jquery-1.2.6.min.js | 24 | = | 0 | + | 24 | + | 0, | ( 5) | ( 0) |
| /.git/ config | 22 | = | 0 | + | 22 | + | 0, | ( 2) | ( 0) |
| /biomems/fonts/ icomoon.woff | 21 | = | 0 | + | 21 | + | 0, | ( 2) | ( 0) |
| /gveronis/edu/ gveronis | 21 | = | 0 | + | 21 | + | 0, | ( 0) | ( 0) |
| / .env | 20 | = | 0 | + | 20 | + | 0, | ( 6) | ( 0) |
| /gp/refs/ gf100-whitepaper.pdf%E2%96%AA | 20 | = | 0 | + | 20 | + | 0, | ( 0) | ( 0) |
| /jxr/ wp-login.php | 16 | = | 0 | + | 16 | + | 0, | ( 0) | ( 0) |
| /SDK/ webLanguage | 13 | = | 0 | + | 13 | + | 0, | ( 0) | ( 0) |
| /phpBB2/ viewtopic.php | 13 | = | 0 | + | 13 | + | 0, | ( 5) | ( 3) |
| Totals: | 3937 | | 4 | | 3933 | |
0, | (16951 ) | 215, |
|---|
| Distinct Hosts: | 0 | | 0 | | 0 | |
-1, | ( 379 ) | ( -1 ) |
|---|
A category is chosen using these tests applied in order:
"Bot?", Hit from the same host requested robots.txt. (As Web indexers do.)
"LSU", Host name matches Perl regular expression \.lsu\.edu$.
"Outside", Any host name.
|
Browsers and other User Agents |
All Brwsrs Brand : Version Pct, ...
48.13% 55.06% Chrome : 129.0.x 12.9%, 139.0.0.0 10.4%,
: 142.0.0.0 6.5%, 135.0.0.0 6.5%, 120.0.x 5.5%,
: 119.0.x 5.4%, 121.0.x 5.1%, 146.0.x 4.8%,
: 131.0.0.0 4.0%, 144.0.0.0 4.0%, 122.0.6x 3.9%.
: Android 3.0%, Linux 9.8%, Macintosh 23.8%,
: Unknown 2.4%, Windows 60.9%, iPhone 0.1%.
23.20% 26.54% Firefox : 111.0 18.4%, 121.0 13.2%, 118.0.2 12.8%,
: 120.0.1 11.3%, 119.0.1 11.0%, 122.0 10.8%,
: 57.0 4.2%, 48.0 4.0%, 140.0 1.8%,
: 146.0 1.8%, 124.0 1.5%.
: Android 0.2%, Linux 23.1%, Macintosh 24.1%,
: Unknown 0.2%, Windows 52.5%.
10.12% 11.58% MSIE : 9.0 91.5%, 10.0 7.4%, 6.0 1.1%.
: Windows 100.0%.
4.31% 4.93% Safari : 537.36 42.6%, 605.1.15 33.9%, 604.1 13.0%,
: 184.1 1.7%, 616.4 0.9%, 6534.47.4 0.9%,
: 6533.18.5 0.9%, 601.1 0.9%, 172.1 0.9%,
: 260.1 0.9%, 180.1 0.9%.
: Android 42.6%, Macintosh 42.6%, iPad 1.7%,
: iPhone 12.2%, iPod 0.9%.
4.12% Chrome Privacy Preserving Prefetch Proxy
1.54% 1.76% Netscape : 5.0 zgrab/0.x 56.1%,
: 5.0 AppleWebKit/537.36 26.8%, 5.0 14.6%,
: 5.0 Gecko/20100101 2.4%.
: Unknown 100.0%.
1.54% websiphon/0.2
1.54% Baiduspider/2.0
0.97% libredtail-http
0.94% silver.inc/2.0
Notes: MSIE refers to Microsoft Internet Explorer, Netscape refers
to Netscape Navigator, SeaMonkey refers to SeaMonkey and to older
versions (called the Mozilla Suite). Firefox
refers to Mozilla Firefox and to older versions (Mozilla Firebird,
Firebird™ and Phoenix). All shows the percentage of
accesses using the corresponding user agent, Brwsrs only counts
recognized web browsers. A version ending in x refers to
multiple sub-versions.
|
Most Frequently Visiting Domains |
Misses Hosts Originating Domain
501 2 78.142.18
327 1 4.232.95
251 1 20.220.232
239 1 193.142.147
163 1 20.151.11
151 1 20.63.96
114 30 google.com
111 1 4.205.37
102 42 amazonaws.com
90 1 37.60.141
|
Most Frequently Visiting Countries or Groups |
Misses Hosts Originating Country or Group
3112 735 Unknown Origin
491 239 com - Commercial
104 36 net - Network Provider
45 16 ninja
34 11 org - Non-commercial, non-governmental organization
15 15 br - Brazil
15 8 arpa
14 3 edu - Educational
12 1 security
10 4 de - Germany
|
Most Frequently Likely Referring Hosts |
Lnks Misses ...From Links on Host Most Common Linking Page and Target
59 202 www.ece.lsu.edu 21 From → /biomems/fonts/icomoon.woff
1 9 faculty.csu.edu.cn All From → /gveronis/edu/gveronis
1 4 www.facebook.com All From → /wp-login.php
Omitted promotional referrers: 201 promoted urls: 49
|
Most Frequently Used Search Strings |
#e #s #p Misses Using Search Strings... ...Found Page (Most Misses)
1 1 1 2 Set-Cookie content /eng/ece
2 1 1 2 wordpress /wp-login.php
#e: Number of different search engines used, link is to the most
common engine.
#s: Number of search strings the line actually reports
on. For example, if the #s entry were 5 and the string shown were "Computers"
the line might report on search strings "Computers", "Computer", "+Computers",
"COMPUTERS", and even "-computers".
#p: Number of distinct pages that
were missed, the one with the most misses from
the string is shown.
Status Codes (Access Outcomes)
Count Code Description
543 400 Syntax error in request.
770 403 Forbidden.
19475 404 Not found.
4 416 Range not satisfiable.
95 500 Server error.
1 501 Not implemented.
