Tempo2 DM polynomial is not a Taylor expansion

Issue #27 new
Paul Ray
created an issue

TEMPO, PINT, and the Tempo2 paper (Eqn 39 of Edwards et al.) treat DM, DM1, DM2, ... as a Taylor expansion around DMEPOCH.

Tempo2 instead uses a polynomial that is not a Taylor expansion. This is noted on line 122 of dm_delays.C. For consistency with other codes, and the paper that defines the Tempo2 timing models, this should be changed to a Taylor series.

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