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When reading the HeaderMerge property, you get different results from Slave Cells than from other cells. Non-Merged header cells always return 1:@FM:1. Master Cells always return the full dimensions of the merged set in cell units. Slave Cells always return negative values indicating the distance from itself to the master cell. For instance, in a 2x2 merged header cell, the bottom-right most header cell, which is a Slave Cell, will return -1:@FM:-1, because the Master Cell is one cell to the left and one cell above the Slave Cell.
