  This erratum addresses an error in the text of Lo et al. (2013) and more
importantly corrects a computational error that was made in all previously
published relativistic computations of absolute pulse waveform fluxes produced
by hot spots on rotating stars that followed the radiation forward in time from
the star to the observer. These computations used an incorrect expression for
the differential emitting area on the stellar surface, as measured in the
comoving frame. This erratum explains this error, lists all the published
papers that contain results affected by this error, and summarizes in a general
way why and how the results in Lo et al. (2013) were affected by this error, in
a way that makes clear why and how the results in the other papers were
affected. The idealized radiation spectra, beaming patterns, and spot shapes
assumed in many of the previously reported computations of pulse waveforms very
likely introduced systematic errors that are much larger than the relatively
small errors introduced by using an incorrect expression for the differential
emitting area. This erratum also corrects an error in the caption of Figure 5,
an error in the text on page 19, and an incomplete description of our results
on page 24.
