I Ching - Coin lands on edge?

Q: My coin rolled across the table and stood perfectly on edge against a book.  Should I discard that throw and throw again for that line?  M.M.

A: When this has happened to me I have recorded the line both ways, resulting in two separate readings, one with a Yang line, and one with Yin for the line where the coin stood on end.  Invariably, both readings have turned out to be necessary to a complete answer to my question.