Some data file formats allow multiple images within one file. The "Im #" box contains the index of the desired image within the file. If "Im #" = -1 (the default) then all images within the file are summed, and "bad" data points ("zingers") are thrown out. If "Im #" is greater than or equal to zero, then just one image is opened. It is assumed that the numbering of the images always starts with zero, no matter what the convention might be for a particular file format. |