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Hi David. Yes to your answer. You can try parabolising from where you are now but you might have to end up correcting the parabola and I think you should stay away from that. What parabolising strokes did you use? Try going back a little bit further till you get more lines, if this doesn't work increase or decrease the slit, experiment. But if you are showing lines inside then you should be showing lines outside. Also are the photos you took in the right order? Send a photo of your tester.
Regards Cristian
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