Fraction of systems exhibiting each number of transiting planets from one to seven within the hot (Teff > 6200 K, red bars) and cool (Teff < 6200 K, blue bars) sub-samples of planet-hosting Kepler stars. There were 132 hot stars and 1504 cool stars in the data used, of which 83% and 73%, respectively, exhibited single transits. Accordingly, transiting systems around hot stars show a stronger tendency toward being single, in agreement with the predictions of our presented model (see the text).