Measure for LD Contour Plot Use this parameter to select the linkage disequilibrium measure to be used in the contour plot. Note : This plot is generated only if all of the markers are biallelic. Available measures are described in the table below: Select: When you want to : (blank space) Omit the generation of a contour plot. CorrCoeff Specify the use of the square of the correlation coefficient for generating a contour plot. Dprime Specify the use of the absolute value of D’ for generating a contour plot . To Specify a Measure to Use: Make a selection using the drop-down menu.