produces two files. Here is Test.png: In the png, the vertical alignment of the bounding box is too low for the \theta in the top box, as I previously reported in Issue #2527, but otherwise it is fine ...

As far as I remember, r means raw string, so \t mustn't interpreter as tab. I tried \\t and other ways to avoid this problem but I didn't find any workaround for this case yet... So it seems to me I ...