Not every extrusion was tested for light yield, so there is a separate table for the test results of those extrusions which were tested. It is keyed to the bar-code of the tested extrusion. Yields from untested extrusions will have to be interpolated from their tested neighbors. Each spool of fiber has a lot number, which is entered into the database along with its test results. Each module has a type A-F, which determnes how many strips are in it.
Some types have a bypass in the center to route fibers around the central hole.
A table of workers. The number of crew members performing a particular task on a module may vary, so there is a separate table for crew member initials and a 3-letter code for the various tasks. The date and time of the task is also entered here, which is redundant. A table of light-leaks. Every module is checked for light leaks, and the locations of the leaks are meant to be entered in this table.