MeyerFig1a: CIELAB difference unclipped: 9.710888, clipped: 27.81245
MeyerFig1b: CIELAB difference unclipped: 9.339009, clipped: 33.25764
MeyerFig2: CIELAB difference unclipped: 11.83805, clipped: 22.98501
MeyerFig3: CIELAB difference unclipped: 14.33687, clipped: 22.26251
MeyerFig4: CIELAB difference unclipped: 15.32125, clipped: 30.50259

Figures 1a and 1b have the same gamut map.  The other three are unique.  Figure 3 uses the map that pulls the the black point down into the tip of the gamut and projects all the dark colors.  Figure 4 uses a less agressive map.

Looking at the CIELAB differences caused by the printing process, I've compared the target and the result figures for the three samples we measured.

Green Wall: 8.278111
Lilac Background: 16.0788	--this yellow green is hard to get right
Leaves: 6.440078