;+ ; NAME: HR_PROJ.pro (procedure) ; PURPOSE : ; Correct for the projection effect of the calibrated magnetic field data observed by the ; vector magnetograph at Huairou Station, Beijing Astronomical Observatory. Show the ; magnetogram for the corrected data on the screen when set /show or save it to a ; PostScript file when set /saveps. ; CATEGORY : ; idl/huairou ; CALLING SEQUENCE : ; hr_proj,fname,oname,BB0,LL0,xv0,yv0,ar=ar,dir=dir,ext=ext,xscale=xscale,yscale=yscale,$ ; saveps=saveps,sname=sname,nstep=nstep,/origin,/show,/back ; INPUTS : ; fname: FITS file name containing the calibrated magnetic field data without extension ; oname: FITS file name to store the corrected data without extension ; OPTIONAL INPUT PARAMETERS : ; BB0 : Latitude of solar disk center (degree >0 for N, <0 for S). default bb0=b0 ; LL0 : Longitude of solar disk center (degree >0 for W, <0 for E). default ll0=0.0 ; xv0 : Frame X coordinate of the ROI center (0