Comparison between measured P_rot (from photometric or spectroscopic time series) and expected maximum P_rot from v sin i and R_⋆. Error bars mark the 1σ tolerance on P_rot, max based on the uncertainties in v sin i and R_⋆. Points falling in the region below the 1-to-1 line (dashed) have contradicting P_rot, v sin i and R_⋆ measurements. Those that fall significantly below (i.e., outside the 1σ error) are marked with a black circle and discussed in Appendix A.2.