The sinogram image is compressed.

Hi,
I have a question.
I performed rodon transform for a image and the sinogram is the middle form.
When I suppose the angular distance is 1, the sinogram is correct but as the angles become wider, sinogram's form compresses.
This image is a 1-180 sinogram with 4 degrees distances.
How can I solve the compressed form problem with wider angles?
Thank you.

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