  We describe how recent determinations of exclusive-mode contributions to
$a_\mu^{\rm LO,HVP}$, the leading-order hadronic vacuum polarization
contribution to the anomalous magnetic moment of the muon, can be used to
provide, up to small electromagnetic (EM) corrections accessible from the
lattice, a data-based dispersive determination of $a_\mu^{\rm lqc;\, IL}$, the
isospin-limit, light-quark-connected contribution to $a_\mu^{\rm LO,HVP}$. Such
a determination is of interest in view of the existence of a number of lattice
results for this quantity, emerging evidence for a tension between lattice and
dispersive determinations of $a_\mu^{\rm LO,HVP}$, and the desire to clarify
the source of this tension. Taking as input for the small EM correction that
must be applied to the purely data-driven dispersive determination the result
$-0.93(58)\times 10^{-10}$ obtained in a recent BMW lattice study, we find
$a_\mu^{\rm lqc;\, IL}$ to be $635.0(2.7)\times 10^{-10}$ if the results of
Keshavarzi, Nomura and Teubner are used for the exclusive-mode contributions
and $638.4(4.1)\times 10^{-10}$ if instead those of Davier, H\"ocker, Malaescu
and Zhang are used.
