This page provides links to centroid tracking plots for each IRS campaign. There are four plots per campaign, labeled "BLUE ACQ", "BLUE SS", "RED ACQ", and "RED SS". These refer to the peak-up acquisition and Sweet Spot images for the blue and red peak-ups. See the IRS Instrument Handbook for a description of the IRS peak-up acquisition algorithm. In each plot, the "X" designates the requested position of the peak-up target. The points show the observed centroid of the peak-up target. The number of outliers (more than 2 pixels from the requested position) is indicated on the plots. These outliers were investigated in more detail in the Peakup False Positives section.