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lit: face-on TF relation

Andersen and Bershady 2003:

*Hence there is a triple penalty at low inclinations for TF studies: (1) erroneously large inclinations lead to undercorrecting the velocity projection, (2) random errors diverge since photometric disk axis ratio measurements have constant errors as a function of axis ratio, and (3) for long-slit studies, P.A. mismatch will always yield systematic underestimates of the projected rotation speed.*
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