9 May 2025 9:46:18.622 PM tec_io_test(): Fortran90 version Test tec_io(). TEC_IO_TEST01 TEC_HEADER_READ can read the header of a TEC file. TEC_DATA_READ can read the data of a TEC file. In this example, we will read data from "ell.dat". TEC_FILE_HEADER_READ - Fatal error! Error while reading the file, searching for TITLE line.