DSET ^air4.5.l TITLE ICOADS 4.5 DSUL UNDEF -9999 OPTIONS BIG_ENDIAN XDEF 180 LINEAR 1 2 YDEF 90 LINEAR -89 2 ZDEF 3 LEVELS 1909 1949 1979 TDEF 12 LINEAR 0Z1jan1 1mo VARS 1 air 3 99 4.5 sigma lower limit ENDVARS