Modelmag

• 在DR7中,modelmag是对每个波段分别进行的.
• 在DR8中,modelmag的参数依照r波段的结果

• cmodel星等,不固定在r波段

• In the SDSS five-band photometry, the aperture in all bands is set by the profile of the galaxy in the r band alone. This procedure ensures that the color measured by comparing the Petrosian flux FP in different bands is measured through a consistent aperture.