  Recent analysis of well-tempered metadynamics (WTmetaD) showed that it
converges without mollification artifacts in the bias potential. Here we
explore how metadynamics heals mollification artifacts, how healing impacts
convergence time, and whether alternative temperings may be used to improve
efficiency. We introduce "$\mu$-tempered" metadynamics as a simple tempering
scheme, inspired by a related mollified adaptive biasing potential (mABP), that
results in artifact independent convergence of the free energy estimate. We use
a toy model to examine the role of artifacts in WTmetaD and solvated alanine
dipeptide to compare the well-tempered and $\mu$-tempered frameworks
demonstrating fast convergence for hill widths as large as $60^{\circ}$ for
$\mu$TmetaD.
