Criteria used for the selection of candidates from the Pan-STARRS survey. The criteria are divided into two sets, one (left panel) aimed at selecting 5 ≲ z ≲ 5.6 candidates and one (right panel) aimed at selecting 5.6 ≲ z ≲ 6.3 candidates. For clarity, we only show sources at 5 < z < 5.6 and at z > 5.6 respectively in the left and right plots. For sources not detected in the r- or i-band, we adopted the 5σ limits of the Pan-STARRS survey for the plot, 23.2 and 23.1, respectively. For sources not detected in the W2 band, we adopted an upper limit of mag W2 = 19 to plot the data. The dashed lines represent the threshold considered in our selection.