Index: src/gmt_customio.c =================================================================== --- src/gmt_customio.c +++ src/gmt_customio.c 2007-06-27 20:45:44.000000000 +0200 @@ -1307,7 +1307,7 @@ *-----------------------------------------------------------*/ struct srf_header6 { /* Surfer 6 file header structure */ - char id[4]; /* ASCII Binary identifier (DSBB) */ + char id[5]; /* ASCII Binary identifier (DSBB) */ short int nx; /* Number of columns */ short int ny; /* Number of rows */ double x_min; /* Minimum x coordinate */