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Internal reviewer comments on the April, 2019, ApJ version
Changes made April, 2019, due to suggestions from Vaidehi:
Updated wording as suggested
Dropped TSvar, because that variability analysis was not used in the paper.
Combined and consolidated tables.
G.Chiaro, M.Meyer, M. Di Mauro, D.Salvetti, G. La Mura, D.J. Thompson
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