Ratio of the estimated fluxes over the observed fluxes of standard stars as a function of sec(z). This example is of the observation on 11th June 2013. This plot is made for every night for every ND filters. The circle, triangle, and square indicate the J, H, and Ks bands, respectively. The solid line, the dotted line, and the dot-dashed line indicate fitting results for the J, H, and Ks bands, respectively.