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Hi Gary
Looking good. Unfortunately the mask type and position is not quite ideal. Because the Ronchi program calculates -even- Ronchi spacings ( even thickness black and white lines) yet your setup shows thick black lines and thin white ones.
I recommend plotting the centers of two white bands on either side of a centered white one . In practise then you'll have nice narrow white bands to compare and no error due to picking the edges of the fatter dark ones, which have overbled due to diffraction. . I suspect that the way you have done the mask may produce an undercorrection which is backed up by your KE readings.
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