M_SOS              51 jcmarker.c     M_SOS   = 0xda,
M_SOS              55 jdmarker.c     M_SOS   = 0xda,
M_SOS             125 rdjpgcom.c     #define M_SOS   0xDA		/* Start Of Scan (begins compressed data) */
M_SOS             172 wrjpgcom.c     #define M_SOS   0xDA		/* Start Of Scan (begins compressed data) */