M_SOF1             19 jcmarker.c     M_SOF1  = 0xc1,
M_SOF1             23 jdmarker.c     M_SOF1  = 0xc1,
M_SOF1            111 rdjpgcom.c     #define M_SOF1  0xC1		/* N indicates which compression process */
M_SOF1            158 wrjpgcom.c     #define M_SOF1  0xC1		/* N indicates which compression process */