  Weinstein, et. al [1] [PRL 106, 052301 (2011)] and Hen, et. al [2] [PRC 85,
047301 (2012)] observed a correlation between the EMC effect and the amount of
short range correlated (SRC) pairs in nuclei which implies that quark
distributions are different in SRC pairs as compared with free nucleons.
Schmookler, et. al [3] [Nature 566, 354 (2019)] bolstered this by showing that
the EMC data can be explained by a universal modification of the structure of
nucleons in neutron-proton SRC pairs and presented the first data-driven
extraction of this universal modification function (UMF).
  Arrington and Fomin [4] [arxiv 1903.12535] attempt to gain insight into the
correlation between the EMC effect and SRCs by distinguishing between
correlated nucleon pairs at high-virtuality (HV) vs. high local-density (LD).
However, there is an inconsistency in their derivations of the UMFs, FLD univ
and FHV , causing a non-physical difference between them for asymmetric nuclei.
In addition, the univ combinatorial scaling they used to extract high-LD np, pp
and nn pairs from measured HV np pairs is contradicted by realistic ab-initio
Quantum Monte-Carlo (QMC) calculations.
