Knowledge Base

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

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 => 18062,
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 => 18.225.92.255,
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 => Z2biadxK@qrWtgl0l30YEgAAAcc,
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 => Z2biadxK@qrWtgl0l30YEgAAAcc,
REDIRECT_HTTP_AUTHORIZATION => ,
FCGI_ROLE => RESPONDER,
PHP_SELF => /index.php,
REQUEST_TIME_FLOAT => 1734795881.4149,
REQUEST_TIME => 1734795881
)
separator .
orderBy id
orderDir asc
1 registerIP
2 access
always
renew
tracker.sid e1aeb461d8525a4ae3caf9b683006d18
tracker.ssid e1aeb461d8525a4ae3caf9b683006d18
tracker.rsid e1aeb461d8525a4ae3caf9b683006d18
session.token d8096eac945d6b9f34d3cdebf076185d
  • site 0.048 seconds (+0.048); 2.00 MB (+2.000) - afterInitialise
  • site 0.074 seconds (+0.027); 2.00 MB (0.000) - afterRoute
  • site 0.107 seconds (+0.033); 4.00 MB (+2.000) - afterDispatch
  • site 0.115 seconds (+0.007); 4.00 MB (0.000) - beforeRenderModule mod_search (Search)
  • site 0.117 seconds (+0.002); 4.00 MB (0.000) - afterRenderModule mod_search (Search)
  • site 0.117 seconds (+0.000); 4.00 MB (0.000) - beforeRenderModule mod_custom (Footer)
  • site 0.117 seconds (+0.000); 4.00 MB (0.000) - afterRenderModule mod_custom (Footer)
  • site 0.118 seconds (+0.000); 4.00 MB (0.000) - beforeRenderModule mod_custom (Footer social links)
  • site 0.118 seconds (+0.000); 4.00 MB (0.000) - afterRenderModule mod_custom (Footer social links)
  • site 0.118 seconds (+0.000); 4.00 MB (0.000) - beforeRenderModule mod_menu (Main Menu)
  • site 0.130 seconds (+0.012); 4.00 MB (0.000) - afterRenderModule mod_menu (Main Menu)
  • site 0.131 seconds (+0.001); 4.00 MB (0.000) - onAfterRender
  • site 0.132 seconds (+0.001); 4.00 MB (0.000) - sessionStore
4 MB

40 Queries Logged: 0.035207509994507 seconds

  1. SELECT data
      FROM `jos_session`
      WHERE `session_id` = '731e421e38156017bafe55cdbc69a67e'
  2. DELETE
      FROM `jos_session`
      WHERE `session_id` = '731e421e38156017bafe55cdbc69a67e'
  3. SELECT data
      FROM `jos_session`
      WHERE `session_id` = 'e1aeb461d8525a4ae3caf9b683006d18'
  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` = 'e1aeb461d8525a4ae3caf9b683006d18'
      LIMIT 1
  6. INSERT INTO `jos_session` (`session_id`,`client_id`,`time`,`ip`)
      VALUES ('e1aeb461d8525a4ae3caf9b683006d18','0','1734795881','18.225.92.255')
  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` <= '2024-12-21 15:44:41' )
      AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= '2024-12-21 15:44:41' )
      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:1734795881;s:18:\"session.timer.last\";i:1734795881;s:17:\"session.timer.now\";i:1734795881;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:\"e1aeb461d8525a4ae3caf9b683006d18\";s:12:\"tracker.ssid\";s:32:\"e1aeb461d8525a4ae3caf9b683006d18\";s:12:\"tracker.rsid\";s:32:\"e1aeb461d8525a4ae3caf9b683006d18\";s:13:\"session.token\";s:32:\"d8096eac945d6b9f34d3cdebf076185d\";}',`time` = '1734795881',`ip` = '18.225.92.255'
      WHERE `session_id` = 'e1aeb461d8525a4ae3caf9b683006d18'
  • 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