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@@ -41,6 +41,13 @@ components = [
 # Notice: It is always a good idea to provide names for systems, elements and components.
 # There is also a convenience function for rotationally symmetric systems `build_rotationally_symmetric_system`.
 
+tiltx_s2 = s.elements["stdelem"].surfaces["s2"].rootcoordinatesystem.tiltx
+tiltx_s3 = s.elements["stdelem"].surfaces["s3"].rootcoordinatesystem.tiltx
+tiltx_s3.changetype("pickup", function=(lambda x: -x), args=(tiltx_s2,))
+s.rootcoordinatesystem.update()
+# Setting tiltx of s3 as -tiltx of s2 via pickup and update coordinate systems afterwards.
+
+
 pyrateoptics.listOptimizableVariables(s, maxcol=30)
 # Lists optimizable variables (the identifiers are keys to a dict which collects them all).