4.4.4 Header data records: The -H option

The -H[i][n_recs] option lets GMT know that input file(s) have one [Default] or more header records. If there are more than one header record you must specify the number after the -H option, e.g., -H4. The default number of header records if -H is used is one of the many parameters in the .gmtdefaults4 file (N_HEADER_RECS), but can be overridden by -Hn_header_recs. Note that blank lines and records that be start with the character # are automatically skipped. Normally, programs that both read and write tables will output the header records that are found on input. Use -Hi to suppress the writing of header records.