I'm trying to put a common legend for two-row RegionPlot. However, I haven't been able to get the colors in the legend right:
ra = RegionPlot[{y >= x^2 - 4 , y >= x^2 - 4 && y <= 0 }, {x, -10,
10}, {y, -10, +10}]
rb = RegionPlot[{y >= x^2 - 16 , y >= x^2 - 16 && y <= 0 }, {x, -20,
20}, {y, -20, +20}]
Legended[GraphicsRow[{ra, rb}, Spacings -> Scaled[0.4],
Epilog -> Inset["Plot Title", Scaled[{0.5, 0.95}]]],
SwatchLegend[{Blue, Orange}, {"label1", "label2"}]]
Legended[GraphicsRow[{ra, rb}, Spacings -> Scaled[0.4],
Epilog -> Inset["Plot Title", Scaled[{0.5, 0.95}]]],
SwatchLegend[{LightBlue, LightOrange}, {"label1", "label2"}]]
I've also tried to change the colors of the regions. However, as far as I could tell, the declared color applied to the boundaries; the interior was a shade lighter, something I couldn't reproduce in the legend. Any ideas on how to address the problem?