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We produce a set of 72 NIR through UV extinction curves by combining newHST/STIS optical spectrophotometry with existing IUE spectrophotometry(yielding gapless coverage from 1150 to 10000 Angstroms) and NIR photometry.These curves are used to determine a new, internally consistent, NIR through UVMilky Way Mean Curve and to characterize how the shapes of the extinctioncurves depend on R(V). We emphasize that while this dependence captures much ofthe curve variability, there remains considerable variation which isindependent of R(V). We use the optical spectrophotometry to verify thepresence of structure at intermediate wavelength scales in the curves. The factthat the optical through UV portions of the curves are sampled at relativelyhigh resolution makes them very useful for determining how extinction affectsdifferent broad band systems, and we provide several examples. Finally, wecompare our results to previous investigations.

astrophysical journal/the astrophysical journal

An Analysis of the Shapes of Interstellar Extinction Curves. VII. Milky  Way Spectrophotometric Optical-through-Ultraviolet Extinction and Its  R-Dependence