The line-of-correlation (LOC) data file simply contains a sequence of age-depth pairs in two tab-delimited columns, preceded by three header lines, as follows:
278 19960813 AGE DEPTH 11 9.08219e-2 .755 1.99553 167.976 9.20918 167.976 11.2385 205.645 15.8344 269.155 19.0417 321.457 19.875 344.554 24.2917 344.554 30.0833 412.402 35.5417 412.402 36.375 424.672
The program will display the contents of the first header line following the LOC file info label at the top of the application but does not try to process the line, so its contents are immaterial to program operation. The header line in the example above contains a hole ID and a date.
The second line contains headers for the two columns of data and the third line gives the number of data lines to follow. The third line is retained for consistency with LOC data files for the original ADP program. However, the code actually skips over these lines without processing them and will just read data lines until it reaches the end of the file.
The third and following lines should contain tab-delimited age and depth values, both in increasing (or at least non-decreasing) order. These values represent the control points of the LOC. A hiatus is represented by two consecutive ages with the same depth. It is also allowed to have two consecutive depths with the same age, but age may not decrease with increasing depth.