I am using MaximDL Pro Version 6.08. The histogram in Screen Stretch for a simple dark image with a short integration time shows a significant gap in the center of the histogram rather than the near Gaussian curve I would expect for a dark image. The range of pixels for the image is 179 thru 499. The histogram shows zero between 280 and 400 but if I adjust the cursers to linearize the displayed levels in the gap (280-400), it shows roughly half of the pixels with gray levels in the image indicating that they are between these levels. This problems is in other more complex images also.