Data was taken by counting the pixels in the x and y directions separating the maximum pixels in each order, and using the Pythagorean Theorem to find the distance across the diagonal.
Although there is no discernible separation before the 10th order (i.e., there are not two distinct peaks), the images get longer, along the axis of diffraction. The length and width of the dots were measured by counting pixels. Since the dots are round to begin with, any elongation will make the length longer than the width, and so the separation between the images is given by the length minus the width.