As of August 8th 2017, Atlas processing charges are based on captures instead of acreage. A capture is the group of images taken simultaneously by the multispectral camera each time the camera is triggered. It is different than the total number of images the camera produces.
For example, one RedEdge capture includes five individual image files (as there are five multispectral imagers on the camera). Since the Sequoia has four multispectral imagers, one Sequoia capture includes four individual image files.
So, for RedEdge, 100 captures would produce about 500 individual image files. But Atlas would only charge per capture: $0.07 x 100 = $7 (note: the minimum charge of $10 would apply here). For Sequoia, the price would be the same, even though there are less individual image files over all.