# Request for CellTypes\_Ephys\_Overview.pdf **URL:** \ **Category:** Technical\ **Tags:** allensdk\ **Created:** [January 3, 2024, 8:31pm UTC](https://community.brain-map.org/t/request-for-celltypes-ephys-overview-pdf/2830 "2024-01-03T20:31:07Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![XinyueMa-neuro](https://yyz1.discourse-cdn.com/flex027/user_avatar/community.brain-map.org/xinyuema-neuro/32/1041_2.png) [@XinyueMa-neuro](https://community.brain-map.org/u/XinyueMa-neuro)\ **Post date:** [January 3, 2024, 8:31pm UTC](https://community.brain-map.org/t/request-for-celltypes-ephys-overview-pdf/2830/1 "2024-01-03T20:31:07Z")
Hi, I am trying to find the documentation describing the definition of electrophysiological features measured in AllenSDK. However the page [http://help.brain-map.org/download/attachments/8323525/CellTypes\_Ephys\_Overview.pdf](http://help.brain-map.org/download/attachments/8323525/CellTypes_Ephys_Overview.pdf) and [http://help.brain-map.org/display/celltypes/Documentation](http://help.brain-map.org/display/celltypes/Documentation) is currently down and may I ask for any help? Could you please post these documents? Thank you! ---
**Author:** ![ray.sanchez](https://yyz1.discourse-cdn.com/flex027/user_avatar/community.brain-map.org/ray.sanchez/32/679_2.png) [@ray.sanchez](https://community.brain-map.org/u/ray.sanchez)\ **Post date:** [January 9, 2024, 6:11am UTC](https://community.brain-map.org/t/request-for-celltypes-ephys-overview-pdf/2830/2 "2024-01-09T06:11:42Z")
Hi there, We’re currently doing some maintenance on our help pages right now, which is probably why you’re not seeing that document - apologies for the inconvenience. I don’t have a timeline yet for when this will be resolved, but I’ve attached the document you requested. Please let me know if this is not the right one or if you need anything else. [CellTypes\_Ephys\_Overview.pdf](https://community.brain-map.org/uploads/short-url/veJ9z4lwAJoxv4Rx23b7KpnUYEp.pdf) (1.2 MB) Thanks for your patience! Ray