This morning, while I was reading from the Torah, someone in my shul noticed that the parchment was not cut evenly (in a straight line). I.e., the bottom piece of parchment seemed to have torn away. This did not affect any of the written portion, it was far below it.
Is one allowed to read from such a Torah? Is there a minimum height of parchment that must exist between the top and bottom margins of a column?