Hi, I have been trying to use a binary file created using fortran by the 'readu' command but I am unable to. My file is a 2 column 121 row array. I could read it if I use a FOR statement like this: INPT = 'COORD_PTS.DAT' OPENR, 14, INPT, /F77_UNFORMATTED FOR J=0,120 DO BEGIN READU, 14, X, Z PRINT,X,Z ENDFOR CLOSE,14 But I want to read it as an array so as to use it for plotting later onwards. Help me how to read it as an array. When I try the following steps: INPT = 'COORD_PTS.DAT' OPENR, 1, INPT, /F77_UNFORMATTED A=FLTARR(2,121) X=A(0,*) Z=A(1,*) READU, 1, X, Z PRINT,X,Z CLOSE,1 I get the error: READU: Attempt to read past end of FORTRAN unformatted file record. Kindly help me sort out the problem. I will be grateful to u.