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How do I get rid of the mesh in this contour plot?

 ContourPlot[x^2 + y^2, {x, -10, 10}, {y, -10, 10}, 
    Contours -> {1.0, 4.0, 10.5}, ContourStyle -> None, 
    ContourShading -> {RGBColor[1, .2, 0, .1], RGBColor[1, .2, 0, .3], 
    RGBColor[1, .2, 0, .5], RGBColor[1, .2, 0, .7]}]

enter image description here

Setting the option Mesh->None doesn't help. I'm using Mathematica 12.1.1

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  • $\begingroup$ That's odd I don't see this in 12.1.1 Windows 10. Try adding MeshStyle -> None or BaseStyle->{EdgeForm[None]} and see if that makes a difference. $\endgroup$
    – flinty
    Aug 2, 2020 at 1:24
  • $\begingroup$ Still problematic with those options set. I'm on MacOS 10.13.6 $\endgroup$
    – QuantumDot
    Aug 2, 2020 at 1:40
  • $\begingroup$ Duplicates: (1400), (20445) $\endgroup$
    – Michael E2
    Aug 2, 2020 at 2:01

2 Answers 2

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From Removing unwanted appearance of underlying mesh, which is a duplicate:

ContourPlot[x^2 + y^2, {x, -10, 10}, {y, -10, 10}, 
 Contours -> {1.0, 4.0, 10.5}, ContourStyle -> None, 
 ContourShading -> {RGBColor[1, .2, 0, .1], RGBColor[1, .2, 0, .3], 
   RGBColor[1, .2, 0, .5], RGBColor[1, .2, 0, .7]}, 
 Method -> {"TransparentPolygonMesh" -> True}]

enter image description here

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The mesh comes from reducing the opacity. To avoid the mesh, use fully opaque colors.

$Version

(* "12.1.1 for Mac OS X x86 (64-bit) (June 19, 2020)" *)

Clear["Global`*"]

ContourPlot[x^2 + y^2, {x, -10, 10}, {y, -10, 10},
 Contours -> {1.0, 4.0, 10.5},
 ContourStyle -> None,
 ContourShading ->
  {LightRed, Pink, Red, Darker[Red]}]

enter image description here

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