M_SOF2            554 jcmarker.c           emit_sof(cinfo, M_SOF2);	/* SOF code for progressive Huffman */
M_SOF2           1029 jdmarker.c         case M_SOF2:		/* Progressive, Huffman */
M_SOF2            300 rdjpgcom.c       case M_SOF2:	process = "Progressive";  break;
M_SOF2            357 rdjpgcom.c         case M_SOF2:		/* Progressive, Huffman */
M_SOF2            307 wrjpgcom.c         case M_SOF2:		/* Progressive, Huffman */