Impact of the UV escape fraction on the ﹩{{\rm{H}}}_{2}﹩ mass fraction for the fiducial escape fraction of 10% (blue), an extremely low escape fraction (1%, brown), and no absorption (100%, pink). The lines show the predictions of the volumetric GK11 and K13 models, but the same figures for other H I/﹩{{\rm{H}}}_{2}﹩ models or the projection-based versions look almost identical. Given that the probed escape fractions (and thus overall UV strengths) vary by a factor of 100, the variation of the ﹩{{\rm{H}}}_{2}﹩ mass by a factor of about three is rather moderate.