posted on Mar, 11 2004 @ 07:28 AM
That looks more like a place where the alpha particle x-ray spectrometer was pressed into the ground to take measurements. The RAT isn't used on soil
and leaves a different appearance.
EDIT: As far as the original post, yes, those black areas are where the data was incomplete. Errors in transmission etc.
[Edited on 11-3-2004 by Kano]