Is there comprehensive documentation of which SMCL tags do and do not work as intended when producing Stata graphs? In
Code:
help graph text
one finds
text elements in Stata graphs support the use of certain SMCL markup directives, or tags, to affect how they appear on the screen
"certain" appears to be the key word here.

For instance, beyond what is documented in help graph text some trial and error suggests that
Code:
{dup #: text}
and
Code:
{space #}
have the desired effects, while many others do not.

Context: This question was prompted by my attempts to use SMCL to create a "beta-hat" symbol in axis labels and graph titles. I've thusfar failed in that attempt. If anyone has suggestions how to do that (whether or not SMCL is used) they would be appreciated.