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C----------------------------------------------------------------------
subroutine ftmrhd(iunit,extmov,xtend,status)
C Move Relative Header Data unit
C move the i/o pointer to the specified HDU and initialize all
C the common block parameters which describe the extension
C iunit i fortran unit number
C extmov i number of the extension to point to, relative to the CHDU
C xtend i returned type of extension: 0 = the primary HDU
C 1 = an ASCII table
C 2 = a binary table
C status i output error status
C
C written by Wm Pence, HEASARC/GSFC, June, 1991
integer iunit,extmov,xtend,status
C COMMON BLOCK DEFINITIONS:--------------------------------------------
integer nb,ne
parameter (nb = 20)
parameter (ne = 200)
integer bufnum,chdu,hdutyp,maxhdu,hdstrt,hdend,nxthdr,dtstrt
integer nxtfld
logical wrmode
common/ft0001/bufnum(199),chdu(nb),hdutyp(nb),maxhdu(nb),
& wrmode(nb),hdstrt(nb,ne),hdend(nb),nxthdr(nb),dtstrt(nb),nxtfld
C END OF COMMON BLOCK DEFINITIONS-----------------------------------
integer ibuff,extno
if (status .gt. 0)return
ibuff=bufnum(iunit)
C calculate the absolute HDU number, then move to it
extno=chdu(ibuff)+extmov
call ftmahd(iunit,extno,xtend,status)
end
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