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TEMPO WarningsPSRCHIVE makes use of tempo to generate polynomials that approximate the relationship between apparent topocentric pulse phase and time. The accuracy of this approximation depends upon the length of time spanned by each polynomial,TZNSPAN , and the number of coefficients,
TZNCOEF .
If a PSRCHIVE program issues a warning like Tempo::Predict::generate WARNING rms=0.411525 microseconds Tempo::Predict::generate http://psrchive.sourceforge.net/warnings/tempothen is it is likely that either TZNSPAN should be
decreased or TZNCOEF should be increased. These
parameters can be set in the input ephemeris file; e.g.
PSRJ 19093744 RAJ 19:09:47.4379988 DECJ 37:44:14.31816 F0 339.31569275868954208 F1 1.6147667945018354534e15 DM 10.393214975272748697 [...] TZRMJD 53477.971476731175557 TZRFRQ 1400 TZNSPAN 120 TZNCOEF 15Note that the span of the polyco is specified in minutes, and the minimum value of TZNSPAN accepted by tempo is 60. The
updated ephemeris can be installed with
pam E updated.eph e new filename.ar
