  The coalescence of two neutron stars is an important gravitational wave
source for LIGO and other detectors. Numerous studies have considered the
precision with which binary parameters (masses, spins, Love numbers) can be
measured. Here I consider the accuracy with which these parameters can be
determined in the presence of systematic errors due to waveform approximations.
These approximations include truncation of the post-Newtonian (PN) series and
neglect of neutron star (NS) spin, tidal deformation, or orbital eccentricity.
All of these effects can yield systematic errors that exceed statistical errors
for plausible parameter values. In particular, neglecting spin, eccentricity,
or high-order PN terms causes a significant bias in the NS Love number. Tidal
effects will not be measurable with PN inspiral waveforms if these systematic
errors are not controlled.
