This diagnostic is useful when trying to understand how the memory window operates for various settings of jmw. Refer to Section 11.3.2 for a description of how the memory window works. It gives a trace of the latitude loop indices indicating the dataflow from disk to memory window as MOM executes. Also indicated are the latitude rows being worked on by various subroutines in preparation for solving the equations on rows in the memory window. As the memory window is moved northward, a listing of ``which rows are copied where'' is given. As new code is added to MOM, it is strongly recommended that this option be included as an aid in verifying that the code is correct. When using this option, disable all diagnostics and execute the model for only a limited number of time steps since the output can get voluminous.