--- header unit 0: primary ---
SIMPLE = T / conforms to FITS standard
BITPIX = 8 / unsigned byte
NAXIS = 3
NAXIS1 = 564
NAXIS2 = 488
NAXIS3 = 3
EXTEND = T
PRODUCT = 'stars-expanded' / Video Align product
STAT = 'MEAN' / frame-stack statistic
NFRAMES = 57 / number of input frames
CHANNELS = 'RGB' / planes 1, 2, 3
BUNIT = 'DN' / digital number