The relative estimation efficiency values are colored according to a color gradient shown under the table of relative estimation efficiency values. You can control the color legend using the options in the Power Analysis red triangle menu. See Color Dashboard.
Figure 16.26 shows the Relative Estimation Efficiency outline for the split-plot designs compared in Split Plot Designs with Different Numbers of Whole Plots.
The Relative Std Error of Estimates report gives the ratio of the standard deviation of a parameter’s estimate to the error standard deviation. These values indicate how large the standard errors of the model’s parameter estimates are, relative to the error standard deviation. For the ith parameter estimate, the Relative Std Error of Estimate is defined as follows:
is the 
.