2018 review of this page revealed errors in the explanation, pictures were not where they should've been, based on the explanation.
I think i fixed it but the layout needs work.

Negative-Spider Aspect (Album 3)
  Album 3 is dedicated to the negative spiders that occurred during different experiments:
3 from passover-monitor tests. The discharges that formed crater patterns on one monitor also formed negative relief lichtenberg figures (radial troughs) on the other monitor's screen.

The visible characteristics of these radial trough features give an indication that the discharge was a single pulse and considerably strong
as contrasted to the discharges between my finger and the screen during earlier tests, (upper left image). See album 2.

In upper right & midl-left image, you will see the spiders that were closely orientated to the crater features, image bottom left. I cannot say for sure which spider is the result of a particular crater but the quantity on each screen is close to equal.

faint spider_302s65 "Go to Larger Image" to larger image Lower Monitor, Session 2 CRT-ScreenPass
You can see the various depths that the streamers will penetrate to clean material away but this is just half of the discharge process. Material has the potential to be deposited back to the streamer paths and if that happens it will be piled tightly along the center of the path.
to larger image Upper Monitor, CRT Screen-pass Session 1
To larger image.
Lower Monitor Features
Here is shown a negative spider group with one having remnant of positive aspect. That redeposition of material was disturbed by the others in the group created in a subsequent pass. Material is typically removed in the initial discharge yet some additional post-discharge deposition occurs, either immediately or on subsequent passes in this 1st session of CRT Screen-pass experiments.
This is a cutout of a larger image from session 2 of CRT screen-pass experiment. Click on the image to go to a larger version. There is also an album of
larger images at  reflection check 6
To larger image.
Upper Monitor Features, Session 2

Album Home    Reflectioncheck 2   E-S-S.com