Digits in a normal control sequence name are not part of the name. \ray@t1 is parsed as \ray@t followed by the digit 1, not a single control sequence \ray@t1. (You can include digits via \csname ray@t1\endcsname, but \def doesn’t work that way.) Solution: use letters instead of digits (\ray@ta, \ray@tb).
Dong Xie, Pennsylvania State University
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