Evaluation of the impact of the image post-processing on the peak value of a nearby companion. The solid curve with error bars shows, in the y-axis, the experimental mean and rms values of the measured peak contrast after image post-processed for various simulated companions contrast at a distance comparable to HD 130948 BC as an input. The x-axis shows the input pre-determined model contrast. The dash line is the y = x curve and represents for comparison the contrast values ideally unaffected by the post-processing stage.