Prime Keys are: ROLLID DB Index Keys are: ROLLID All Keywords for series mdi.roll_table: ROLLID (string) roll table identifier COMMENT (string) Commentary on the data INSTRUME (string) Instrument ORIGIN (string) Organization that created FITS file TELESCOP (string) Observatory; SOHO HISTORY (string) Old path Segments for series mdi.roll_table: data bin generic MDI Roll Table