Contour plot of the event rate of gaseous lensing for various parameters of the lensing clouds, for the MACHO detection efficiency function. A polytrope ﹩n=1.5﹩ is assumed, and threshold magnification ﹩A_{t}=1.35﹩. All the symbols and lines are the same as in Fig. 5. Note the substantial decrease of the event rate due to MACHO’s reduced sensitivity to short‐timescale events.