In the Main Panel field you can see the radio spectral data for any radio source in the cluster. ... You can see the name of current radio source on upper left button and as the title of the graphic. The red approximational curve on the graphic is drawn as it's described in the Fitting help . ... The supplementary Graphic Info window ( opened together with the Main Panel ) serves for displaying of the spectral information (see The mouse manipulation below). ... Details see in Fitting help . ...