Fraction of HJs orbiting cluster (brown) and field (skyblue) stars as a function of P_high threshold which is used to separate the aforementioned two groups. The numbers next to the HJs fraction correspond to the numbers of HJs and the total number of planets that are used to compute these fractions. The upperlimit for the HJs orbital period was set at 10 (top), 20 (middle), and 30 (bottom) days. The P_AD values on top of the panels show the results of the AD test comparing the distributions of the ages of the cluster and field stars. The errorbars represent a 68.3% (1σ) interval.