Scatterplot matrix comparing platforms. Scatterplot matrices for 20 human breast cancer samples are shown for each pair of platforms. The scatterplot matrices are based on the vectors of PCF values. Panels off the diagonal: For each of the 20 samples, PCF values are found for one platform were plotted against values found for another. Abscissa values are for the Agilent 44 k (left column), ROMA/NimbleGen 82 k (middle column) and Illumina 109 k (right column) platforms. Ordinate values are for the Agilent 44 k (top row), ROMA/NimbleGen 82 k (middle row) and Illumina 109 k (bottom row) platforms. Panels on the diagonal: The distribution of the PCF filtered log ratios for all 20 breast cancer samples combined, for the Agilent 44 k (top left panel), ROMA/NimbleGen 82 k (middle panel) and Illumina 109 k (lower right panel) platforms, respectively.