I got a problem in Heartbeat artifact removal. I used the event>Detect Heat Beat and it detected the heart beat successfully, but when I am trying to use Artifact to remove the heartbeat artifact the SSP ECG:cardiac tab is not available.
Probably because you already imported the files in the database.
Computing SSP/ICA projectors is only available for "Link to raw files".
If for some reason you don't have access to the original continuous file in order to process it as recommended (as a "continuous" file, a link created with the menu "Review raw file"), you can convert back the imported epochs to continuous binary files with the popup menu "Review as raw".