K-corrections using their K\_CORRECT program, version 4.1.4, originally developed by Blanton et al. (2003) and now extended to handle GALEX data (Blanton & Roweis 2007). We corrected the observed magnitudes (FUV-to-NIR magnitudes) of the sample galaxies into the magnitudes at redshift z = 0. We did not consider the evolutionary correction on the magnitudes of galaxies since it won’t be large in the redshift range of our sample. We did not further consider aperture corrections for the magnitudes among three surveys since the Petrosian magnitudes in SDSS, fit extrapolation magnitudes in 2MASS and calibrated magnitudes in GALEX have been good tracers of the total luminosities of these galaxies.

For the internal reddening of the galaxy, we input dust extinction in the PEGASE model, then get the model SEDs after extinction when do SED fittings. As for the values of internal extinction $A_V$, we adopt two methods, one is constant dust extinction, i.e., $A_V$=0.6 mag for LSBGs and $A_V$=0.8 mag for HSBGs, and another one is assuming $A_V$ as a free parameter varying from 0.1 to 1.6 in the fitting procedures, which come from Liang et al. (2010) about the dust extinction estimates from Balmer decrement for related samples. More information 