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Revised (B-V)_0-Mg_2 data for 402 elliptical galaxies are given to testreddening predictions which can also tell us both what the intrinsic errors arein this relationship among gE galaxy stellar populations, as well as details ofnearby structure in the interstellar medium (ISM) of our Galaxy and of theintrinsic errors in reddening predictions. Using least-squares fits, theexplicit 1-sigma errors in the Burstein-Heiles (BH) and the Schlegel et al.(IR) predicted reddenings are calculated, as well as the 1-sigma observationalerror in the (B-V)_0-Mg_2 for gE galaxies. It is found that, in directions withE(B-V)<0.100 mag (where most of these galaxies lie), 1-sigma errors in the IRreddening predictions are 0.006 to 0.009 in E(B-V) mag, those for BH reddeningprediction are 0.011 mag, and the 1-sigma agreement between the two reddeningpredictions is 0.007 mag. IR predictions have an accuracy of 0.010-0.011 mag indirections with E(B-V)>= 0.100 mag, significantly better than those of the BHpredictions (0.024-0.025). Gas-to-dust variations that vary by a factor of 3,both high and low, exist along many lines-of-sight in our Galaxy. The approx0.02 higher reddening zero point in E(B-V) previously determined by Schlegel etal. is confirmed, primarily at the Galactic poles. Despite this, both methodsalso predict many directions with E(B-V)<0.015 mag. Independent evidence ofreddening at the North Galactic pole is reviewed, with the conclusion thatthere still exists directions at the NGP that have E(B-V)<<0.01. Two lines ofevidence suggest that IR reddenings are overpredicted in directions with highgas-to-dust ratios. As high gas-to-dust directions in the ISM also include theGalactic poles, this overprediction is the likely cause of the E(B-V) = 0.02mag larger IR reddening zero point.Comment: 5 figure

Line-of-Sight Reddening Predictions: Zero Points, Accuracies, the Interstellar Medium, and the Stellar Populations of Elliptical Galaxies