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Description
The mysterious lines under 27 x magnification, in what should be a continuous output. The ones to the right appear throughout the image in a regular pattern, and could easily be attributed to rounding of field height values. Lines or no lines does depend on the number of fields requested, e.g. 360 vs 363. The lines on the right are areas of transparency, as demonstrated by the background: a white layer, partially hidden under a black one. The contrast is obvious. The same was done with the lines on the left, but no obvious transparency here. Besides, in this case they didn't appear thought the entire image, only in certain areas. A mystery yet unsolved.

Edit: on the resized jpg the 'mysterious' ones seem to have gone. Same for my locally created jpeg, I hadn't even noticed it (and yet the local thumbnail shows them). The contrast was probably too low for JPEG to handle. They're still there in the png though, and PNG's word is final.

Edit 2: it turns out I lied: with very fine-grained settings these stripes occur at all field number values, distributed regularly across the image and indeed as transparent areas. But is you allow multiple runs with overlapping layers, that a) can be very confusing and b) can fix the issue as well.

Description
The mysterious lines under 27 x magnification, in what should be a continuous output. The ones to the right appear throughout the image in a regular pattern, and could easily be attributed to rounding of field height values. Lines or no lines does depend on the number of fields requested, e.g. 360 vs 363. The lines on the right are areas of transparency, as demonstrated by the background: a white layer, partially hidden under a black one. The contrast is obvious. The same was done with the lines on the left, but no obvious transparency here. Besides, in this case they didn't appear thought the entire image, only in certain areas. A mystery yet unsolved.

Edit: on the resized jpg the 'mysterious' ones seem to have gone. Same for my locally created jpeg, I hadn't even noticed it (and yet the local thumbnail shows them). The contrast was probably too low for JPEG to handle. They're still there in the png though, and PNG's word is final.

Edit 2: it turns out I lied: with very fine-grained settings these stripes occur at all field number values, distributed regularly across the image and indeed as transparent areas. But is you allow multiple runs with overlapping layers, that a) can be very confusing and b) can fix the issue as well.