Level 2 Data (Fits file,File is ending with C2.fits) It is full disk LOS magnetic field data
For example : Fm170712000737P00AL5C2.fits

Level 3 Data (Compressed Fits file. File is ending with C3.fits.gz) It is full disk vector magnetic field data
(only the NOAA active region is calibrated)，size=[992,992,3] with Bx,By,Bz
For example : Fm170712000737P00AL5C3.fits.gz