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Data Visualizationhard
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A heatmap represents a matrix MijM_{ij}Mij​ where the color intensity is proportional to the value. If Mij=i+jM_{ij} = i + jMij​=i+j for i,j∈{1,2,3}i,j \in \{1, 2, 3\}i,j∈{1,2,3}, what is the intensity difference between the cell (1,1)(1, 1)(1,1) and the cell (3,3)(3, 3)(3,3)?