In an answer to a previous question, it is explained that
will produce an arrow pointed to the right with the
\sim symbol above it (e.g., to indicate that a map is an isomorphism).
However, I'm not satisfied with the spacing of this symbol, as it appears too high above the arrow:
Is there a way to move it down? Potentially the arrow would have to be widened a little, to prevent
\sim from touching the arrowhead.