Strategy for determining traces from non-odd/even high-density fiber data

In the ideal case, in order to determine the traces for high-density fiber data, two quartz exposures need to be prepared, one with the even-numbered fibers illuminated, and the other with the alternate odd-numbered fibers illuminated.

However, this has not been possible for recent high-density fiber data from LAM. Please develop a rough strategy of determining the traces from such data in order to reduce those data.