termlength srccredit valign bottom middle top width contentwidth format BMP CGM-BINARY CGM-CHAR CGM-CLEAR DITROFF DVI EPS EQN FAX GIF GIF87a GIF89a IGES JPEG JPG linespecific PCX PIC PNG PS SGML SVG TBL TEX TIFF WMF WPG entityref fileref scalefit depth scale contentdepth align