Real marker shapes: o, s, ^, v, <, >, D/d, +, x/X-2-1012-20246scatter(): shape distinguishes groups, not just colorcontroltreatedcensoredexcluded0246810-1-0.500.51diamond, outlinedplusplot(): markers with an outline, on a dashed/dotted linediamond, outlinedplusReal marker shapes: o, s, ^, v, <, >, D/d, +, x/X