Newcommand -- make symbol independent of font size

[Bernt Lie]

I'm trying to define the "plimsoll" symbol (used to indicate thermodynamic standard condition). I found on the internet the following suggestion:



\newcommand\plimsoll{{\circ\kern-0.495em-}}



Seems like a good number ("0.495" -- I've also tried with "0.415") depends on the font size... Here is what it looks like in a Section heading (ok with "0.415"):

[cid:image001.png at 01D9C2D1.91829D70]



And here is what it looks like in displayed equation (ugly):

[cid:image002.png at 01D9C2D1.91829D70]



  *   How can I make the definition so that it looks fine in any font size?



BL
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