M_SOF1            558 jcmarker.c           emit_sof(cinfo, M_SOF1);	/* SOF code for non-baseline Huffman file */
M_SOF1           1024 jdmarker.c         case M_SOF1:		/* Extended sequential, Huffman */
M_SOF1            299 rdjpgcom.c       case M_SOF1:	process = "Extended sequential";  break;
M_SOF1            356 rdjpgcom.c         case M_SOF1:		/* Extended sequential, Huffman */
M_SOF1            306 wrjpgcom.c         case M_SOF1:		/* Extended sequential, Huffman */