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Fig. 1

image

OC diagram of a simulation of N = 10 timing measurements drawn from a normal distribution with a standard deviation of σT = 1 against the intrinsic ephemeris, with individual errors also of ±1. The time unit is irrelevant in these simulations and any unit can be assumed. The intrinsic (correct) ephemeris would be a horizontal line at O−C = 0 (not shown). The solid line shows the best fit to these measurements. The period error, given by Eq. (7), which is ±0.1101 time units per epoch, is indicated by the slopes of the dashed lines. In this particular simulation, the reduced chi-square against the intrinsic ephemeris was 0.64, whereas the reduced chi-square against the fit was 0.75.

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