Today I have found and fixed a bug that could seriously upset the MAKEMAP "maptol" convergence test when used with data that has been split into more than one chunk. Basically, the map at the end of the first iteration on each new chunk was compared with the final map from the previous chunk, rather than with a blank map full of zeros. The effect of this could be to produce spurious values for the "normalized map change" reported at the end of each iteration, and thus cause the iterative loop to be left prematurely.
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