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This problem is no longer there after I upgraded to Mathematica 10.0.2.

If I set OperatorSubstitution to False, the labels of Plot will not use the typeface specified by FontFamily unless FontSize is more than certain number.

In this test scenario, that certain number is 14 and the typeface is Ubuntu (Regular) (TTF fonts available from

SetOptions[Plot, AspectRatio -> 1, ImageSize -> {200, 200}]; 
  Plot[x, {x, 0, 1}, 
    LabelStyle -> {FontFamily -> "Ubuntu", FontSize -> 14}, 
    BaseStyle -> {PrivateFontOptions -> {"OperatorSubstitution" -> True}}], 
  Plot[x, {x, 0, 1}, 
    LabelStyle -> {FontFamily -> "Ubuntu", FontSize -> 14}, 
    BaseStyle -> {PrivateFontOptions -> {"OperatorSubstitution" -> False}}], 
  Plot[x, {x, 0, 1}, 
    LabelStyle -> {FontFamily -> "Ubuntu", FontSize -> 15}, 
    BaseStyle -> {PrivateFontOptions -> {"OperatorSubstitution" -> False}}]

15 is the threshold.

Only some typefaces are affected (eg Inconsolata is fine). Is this a bug?

I'm using Mathematica 9 for Mac.

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