Knowledge Base

Main page

Practice Plots

When you score pulsar data plots you will be asked to score each sub-plot separately. If enough of the subplots look like a pulsar then it’s worth conducting a follow-up observation with the GBT!

In Prepfold Plots, the subplots you will grade are: Integrated Pulse Profile, Time Domain Plot, Sub-band Plot and DM Plot. 

plot anatomy

In Single Pulse Plots you will grade the DM subplot, S/N Histogram, and DM Histogram.

Ready to try grading some plots?

First Look at the plot below.  What grade would you give each of the subplots?  Your choices for each subplot are are “not a pulsar”, “maybe a pulsar” and “pulsar”.

There are several plots in each embedded slide show below. Each time you click on the image, a grade and an explanation will appear for a subplot.  Try scoring these plots yourself, or together as a class or club.  Advance to a new plot at the bottom of the slide deck using the right arrow. Discuss on the forum!

Prep-fold Periodicity Plots:

Single Pulse Plots:

0 Dislike

Last updated @ on

Comments on this entry

There are no comments on this entry.

Post a comment

Post a comment

Comments are closed on this entry.

Please keep comments relevant to this entry. Comments deemed offensive or inappropriate may be removed.

Debug Console

Close4 MBRequestSessionTimelineDatabase40Events23
$_GET
Array( ) Array(

)
$_POST
Array( ) Array(

)
$_COOKIE
Array( ) Array(

)
$_SERVER
Array( TEMP => /var/www/tmp, TMPDIR => /var/www/tmp, TMP => /var/www/tmp, PATH => /usr/lo... Array(
TEMP => /var/www/tmp,
TMPDIR => /var/www/tmp,
TMP => /var/www/tmp,
PATH => /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin,
USER => apache,
HOME => /usr/share/httpd,
SCRIPT_NAME => /index.php,
REQUEST_URI => /kb/usefulresources/practice-plots,
QUERY_STRING => ,
REQUEST_METHOD => GET,
SERVER_PROTOCOL => HTTP/1.1,
GATEWAY_INTERFACE => CGI/1.1,
REDIRECT_URL => /kb/usefulresources/practice-plots,
REMOTE_PORT => 63570,
SCRIPT_FILENAME => /var/www/pulsars/index.php,
SERVER_ADMIN => root@localhost,
CONTEXT_DOCUMENT_ROOT => /var/www/pulsars,
CONTEXT_PREFIX => ,
REQUEST_SCHEME => https,
DOCUMENT_ROOT => /var/www/pulsars,
REMOTE_ADDR => 18.218.41.144,
SERVER_PORT => 443,
SERVER_ADDR => 157.182.3.38,
SERVER_NAME => pulsars.nanograv.org,
SERVER_SOFTWARE => Apache/2.4.37 (Rocky Linux) OpenSSL/1.1.1k,
SERVER_SIGNATURE => ,
HTTP_HOST => pulsars.nanograv.org,
HTTP_ACCEPT_ENCODING => gzip, br, zstd, deflate,
HTTP_USER_AGENT => Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com),
HTTP_ACCEPT => */*,
SSL_TLS_SNI => pulsars.nanograv.org,
HTTPS => on,
SCRIPT_URI => https://pulsars.nanograv.org/kb/usefulresources/practice-plots,
SCRIPT_URL => /kb/usefulresources/practice-plots,
UNIQUE_ID => Z5Cjs5tsHyJbpNRXRcw7SQAAAE8,
HTTP_AUTHORIZATION => ,
REDIRECT_STATUS => 200,
REDIRECT_SSL_TLS_SNI => pulsars.nanograv.org,
REDIRECT_HTTPS => on,
REDIRECT_SCRIPT_URI => https://pulsars.nanograv.org/kb/usefulresources/practice-plots,
REDIRECT_SCRIPT_URL => /kb/usefulresources/practice-plots,
REDIRECT_UNIQUE_ID => Z5Cjs5tsHyJbpNRXRcw7SQAAAE8,
REDIRECT_HTTP_AUTHORIZATION => ,
FCGI_ROLE => RESPONDER,
PHP_SELF => /index.php,
REQUEST_TIME_FLOAT => 1737532339.0298,
REQUEST_TIME => 1737532339
)
separator ⇒ .
orderBy ⇒ id
orderDir ⇒ asc
1 ⇒ registerIP
2 ⇒ access
always ⇒
renew ⇒
tracker.sid ⇒ a81fa15d291418dccc9cb1d2ca9ec886
tracker.ssid ⇒ a81fa15d291418dccc9cb1d2ca9ec886
tracker.rsid ⇒ a81fa15d291418dccc9cb1d2ca9ec886
session.token ⇒ bc8dcc92c04b382c96a4f01a7466cbc4
  • site 0.037 seconds (+0.037); 2.00 MB (+2.000) - afterInitialise
  • site 0.058 seconds (+0.021); 2.00 MB (0.000) - afterRoute
  • site 0.085 seconds (+0.027); 4.00 MB (+2.000) - afterDispatch
  • site 0.092 seconds (+0.006); 4.00 MB (0.000) - beforeRenderModule mod_search (Search)
  • site 0.094 seconds (+0.002); 4.00 MB (0.000) - afterRenderModule mod_search (Search)
  • site 0.094 seconds (+0.000); 4.00 MB (0.000) - beforeRenderModule mod_custom (Footer)
  • site 0.094 seconds (+0.001); 4.00 MB (0.000) - afterRenderModule mod_custom (Footer)
  • site 0.094 seconds (+0.000); 4.00 MB (0.000) - beforeRenderModule mod_custom (Footer social links)
  • site 0.095 seconds (+0.000); 4.00 MB (0.000) - afterRenderModule mod_custom (Footer social links)
  • site 0.095 seconds (+0.000); 4.00 MB (0.000) - beforeRenderModule mod_menu (Main Menu)
  • site 0.105 seconds (+0.010); 4.00 MB (0.000) - afterRenderModule mod_menu (Main Menu)
  • site 0.106 seconds (+0.001); 4.00 MB (0.000) - onAfterRender
  • site 0.107 seconds (+0.001); 4.00 MB (0.000) - sessionStore
4 MB

40 Queries Logged: 0.019163608551025 seconds

  1. SELECT data
      FROM `jos_session`
      WHERE `session_id` = '8aec995e207925f221d89698526550db'
  2. DELETE
      FROM `jos_session`
      WHERE `session_id` = '8aec995e207925f221d89698526550db'
  3. SELECT data
      FROM `jos_session`
      WHERE `session_id` = 'a81fa15d291418dccc9cb1d2ca9ec886'
  4. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_languages'
  5. SELECT session_id
      FROM `jos_session`
      WHERE `session_id` = 'a81fa15d291418dccc9cb1d2ca9ec886'
      LIMIT 1
  6. INSERT INTO `jos_session` (`session_id`,`client_id`,`time`,`ip`)
      VALUES ('a81fa15d291418dccc9cb1d2ca9ec886','0','1737532339','18.218.41.144')
  7. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_members'
  8. SELECT b.id, b.title
      FROM `jos_usergroups` AS `a`
      LEFT JOIN jos_usergroups AS b
      ON b.lft <= a.lft
      AND b.rgt >= a.rgt
      WHERE `a`.`id` = '1'
  9. SELECT *
      FROM `jos_viewlevels`
  10. SELECT folder AS type,element AS name,protected,params
      FROM `jos_extensions`
      WHERE `enabled` >= '1'
      AND `type` = 'plugin'
      AND `state` >= '0'
      AND `access` IN ('1','1')
      ORDER BY `ordering` ASC
  11. SELECT m.id,m.menutype,m.title,m.alias,m.note,m.path AS route,m.link,m.type,m.level,m.language,m.browserNav,m.access,m.params,m.home,m.img,m.template_style_id,m.component_id,m.parent_id,e.element AS component
      FROM `jos_menu` AS `m`
      LEFT JOIN jos_extensions AS e
      ON e.extension_id = m.component_id
      WHERE `m`.`published` = '1'
      AND `m`.`parent_id` > '0'
      AND `m`.`client_id` = '0'
      ORDER BY `m`.`lft` ASC
  12. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_kb'
  13. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_tags'
  14. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_categories'
  15. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`extension` = 'com_kb'
      AND `jos_categories`.`alias` = 'usefulresources'
      AND `jos_categories`.`published` = '1'
  16. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`extension` = 'com_kb'
      AND `jos_categories`.`alias` = 'practice-plots'
      AND `jos_categories`.`published` = '1'
  17. SELECT jos_template_styles.id,jos_template_styles.home,jos_template_styles.template,jos_template_styles.params,jos_extensions.protected
      FROM `jos_template_styles`
      INNER JOIN jos_extensions
      ON jos_extensions.element = jos_template_styles.template
      WHERE `jos_template_styles`.`client_id` = '0'
      AND `jos_extensions`.`enabled` = '1'
      AND `jos_extensions`.`type` = 'template'
      AND jos_extensions.`client_id` = `jos_template_styles`.`client_id`
      ORDER BY `home` DESC
  18. SELECT *
      FROM `jos_kb_articles`
      WHERE `jos_kb_articles`.`alias` = 'practice-plots'
      AND `jos_kb_articles`.`category` = '35'
  19. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`id` = '35'
  20. SELECT jos_tags_object.label,jos_tags.*
      FROM `jos_tags`
      INNER JOIN jos_tags_object
      ON jos_tags_object.tagid = jos_tags.id
      WHERE `jos_tags_object`.`tbl` = 'kb'
      AND `jos_tags_object`.`objectid` = '59'
      AND `jos_tags`.`admin` NOT IN ('1')
      GROUP BY jos_tags_object.label,jos_tags.id
  21. SELECT category,count(*) AS articles
      FROM `jos_kb_articles`
      WHERE `jos_kb_articles`.`state` = '1'
      AND `jos_kb_articles`.`access` IN ('1','1')
      GROUP BY category
  22. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`extension` = 'com_kb'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1')
      AND `jos_categories`.`parent_id` = '1'
      ORDER BY `title` ASC
  23. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '34'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1')
  24. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '19'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1')
  25. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '18'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1')
  26. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '31'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1')
  27. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '32'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1')
  28. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '33'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1')
  29. SELECT *
      FROM `jos_categories`
      WHERE `jos_categories`.`parent_id` = '35'
      AND `jos_categories`.`published` = '1'
      AND `jos_categories`.`access` IN ('1','1')
  30. SELECT *
      FROM `jos_kb_comments`
      WHERE `jos_kb_comments`.`entry_id` = '59'
      AND `jos_kb_comments`.`state` IN ('1','3')
  31. SELECT *
      FROM `jos_kb_comments`
      WHERE `jos_kb_comments`.`id` = '0'
  32. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_users'
  33. SELECT m.id,m.title,m.module,m.position,m.content,m.showtitle,m.params,mm.menuid,e.protected
      FROM `jos_modules` AS `m`
      LEFT JOIN jos_modules_menu AS mm
      ON mm.moduleid = m.id
      LEFT JOIN jos_extensions AS e
      ON e.element = m.module
      AND e.client_id = m.client_id
      WHERE `m`.`published` = '1'
      AND `e`.`enabled` = '1'
      AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= '2025-01-22 07:52:19' )
      AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= '2025-01-22 07:52:19' )
      AND `m`.`access` IN ('1','1')
      AND `m`.`client_id` = '0'
      AND (`mm`.`menuid` = '82' OR `mm`.`menuid` <= '0' )
      ORDER BY `m`.`position` ASC,`m`.`ordering` ASC
  34. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_search'
  35. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_content'
  36. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_courses'
  37. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_events'
  38. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_newsletter'
  39. SELECT extension_id AS id,element AS "option",params,enabled
      FROM `jos_extensions`
      WHERE `type` = 'component'
      AND `element` = 'com_psrsearch'
  40. UPDATE `jos_session`
      SET `data` = '__default|a:10:{s:15:\"session.counter\";i:1;s:19:\"session.timer.start\";i:1737532339;s:18:\"session.timer.last\";i:1737532339;s:17:\"session.timer.now\";i:1737532339;s:8:\"registry\";O:23:\"Hubzero\\Config\\Registry\":2:{s:7:\"\0*\0data\";O:8:\"stdClass\":1:{s:1:\"0\";s:7:\"session\";}s:9:\"separator\";s:1:\".\";}s:4:\"user\";C:17:\"Hubzero\\User\\User\":22:{a:1:{s:5:\"guest\";b:1;}}s:11:\"tracker.sid\";s:32:\"a81fa15d291418dccc9cb1d2ca9ec886\";s:12:\"tracker.ssid\";s:32:\"a81fa15d291418dccc9cb1d2ca9ec886\";s:12:\"tracker.rsid\";s:32:\"a81fa15d291418dccc9cb1d2ca9ec886\";s:13:\"session.token\";s:32:\"bc8dcc92c04b382c96a4f01a7466cbc4\";}',`time` = '1737532339',`ip` = '18.218.41.144'
      WHERE `session_id` = 'a81fa15d291418dccc9cb1d2ca9ec886'
  • onAfterInitialise — Method — plgSystemP3p::onAfterInitialise → /core/plugins/system/p3p/p3p.php:21
  • onAfterInitialise — Method — plgSystemRemember::onAfterInitialise → /core/plugins/system/remember/remember.php:20
  • onAfterInitialise — Method — plgSystemHubzero::onAfterInitialise → /core/plugins/system/hubzero/hubzero.php:21
  • onAfterInitialise — Method — plgSystemXFeed::onAfterInitialise → /core/plugins/system/xfeed/xfeed.php:21
  • onAfterInitialise — Method — plgSystemSupergroup::onAfterInitialise → /core/plugins/system/supergroup/supergroup.php:113
  • onAfterInitialise — Method — plgSystemReferrerpolicy::onAfterInitialise → /core/plugins/system/referrerpolicy/referrerpolicy.php:21
  • onAfterRoute — Method — plgSystemJquery::onAfterRoute → /core/plugins/system/jquery/jquery.php:21
  • onAfterRoute — Method — plgSystemSpamjail::onAfterRoute → /core/plugins/system/spamjail/spamjail.php:21
  • onAfterRoute — Method — plgSystemIncomplete::onAfterRoute → /core/plugins/system/incomplete/incomplete.php:21
  • onAfterRoute — Method — plgSystemUnconfirmed::onAfterRoute → /core/plugins/system/unconfirmed/unconfirmed.php:21
  • onAfterRoute — Method — plgSystemUnapproved::onAfterRoute → /core/plugins/system/unapproved/unapproved.php:21
  • onAfterRoute — Method — plgSystemPassword::onAfterRoute → /core/plugins/system/password/password.php:21
  • onContentPrepare — Method — plgContentLoadmodule::onContentPrepare → /core/plugins/content/loadmodule/loadmodule.php:35
  • onContentPrepare — Method — plgContentEmailcloak::onContentPrepare → /core/plugins/content/emailcloak/emailcloak.php:25
  • onContentPrepare — Method — plgContentPagebreak::onContentPrepare → /core/plugins/content/pagebreak/pagebreak.php:35
  • onContentPrepare — Method — plgContentXhubtags::onContentPrepare → /core/plugins/content/xhubtags/xhubtags.php:25
  • onContentPrepare — Method — plgContentFormatwiki::onContentPrepare → /core/plugins/content/formatwiki/formatwiki.php:63
  • onContentPrepare — Method — plgContentFormathtml::onContentPrepare → /core/plugins/content/formathtml/formathtml.php:105
  • onContentPrepare — Method — plgContentExternalhref::onContentPrepare → /core/plugins/content/externalhref/externalhref.php:41
  • onAfterDispatch — Method — plgSystemMobile::onAfterDispatch → /core/plugins/system/mobile/mobile.php:22
  • onAfterDispatch — Method — plgSystemDebug::onAfterDispatch → /core/plugins/system/debug/debug.php:60
  • onAfterDispatch — Method — PlgSystemHighlight::onAfterDispatch → /core/plugins/system/highlight/highlight.php:25
  • onAfterRender — Method — plgSystemSef::onAfterRender → /core/plugins/system/sef/sef.php:21