Length of header record| 54 bytes | same as data records -----------------------|----------------------|---------------------; Header information | as described in paper| ? -----------------------|----------------------|---------------------; Offset in data records | 6 bytes | 4 bytes -----------------------|----------------------|---------------------; Before reading tapes written in Optronics format, the user must know which of the formats, described above, that the tapes are written in. 'TR O'--Read Optronics tapes, MPI Goettingen format. [Using 'TR O', the file information (NSAM,NROW) is taken from the tape file header. Be sure that this information is correct!] 'TR OC'--Read Optronics tapes, MPI Goettingen format, and check the tape file dimensions. [Needs a considerable amount of time--about twice that of 'TR O'.] 'TR OM'--Read Optronics tapes, MPI Goettingen format, and store a mirrored version of the tape file in the output file. [According to the scanning of the film, it might be necessary to create the mirrored version of the tape file.] 'TR OCM'--Read Optronics tapes, MPI Goettingen format, check the tape file dimensions, and store the mirrored version of the tape file in the output file. 'TR B'--Read Optronics tapes, Biozentrum Basel format. ['TR BM' is allowed; 'TR BC' would not make sense because the tape file dimensions are already checked using 'TR B'.] NOTES: 1. NSAM must be less than or equal to 512. 2. The further usage is as described under 'TR'. Subroutines: Caller: TAPE1