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tokens: The authors thank Lou Boyd of Fairborn Observatory and Brian Skiff and Len Bright of Lowell Observatory for their years of crucial support to the APT and SSS programs. R.R.R. thanks the National Solar Observatory for support as an Emeritus Astronomer. G.W.L. thanks Lowell Observatory for informal emeritus status, access to facilities, and travel support in continuing post-retirement stellar research. G.W.H. acknowledges long-term support from NASA, NSF, Tennessee State University, and the State of Tennessee through its Centers of Excellence program. The referee’s careful reading and knowledgeable comments enabled us to improve the overall scholarship of our paper and expand our discussion of the results, and we appreciate that anonymous contribution. This research utilized data courtesy of NASA/ SORCE and the SIM and TIM science teams, and SOLIS data obtained by the NSO Integrated Synoptic Program (NISP), managed by the National Solar Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc. under a cooperative agreement with the National Science Foundation. This research has made use of the SIMBAD database and its VizieR catalog access tool, especially the catalog of MK spectral types (B/mk/mktypes) created and maintained by Brian Skiff of Lowell Observatory. SIMBAD and VizierR are operated at CDS, Strasbourg, France (Wenger et al. 2000 ). For the two lead authors, this paper will likely be our final word on this subject.