1. Space Telescope Science Institute, Baltimore, MD 21218, USA.
2. University of California Observatories–Lick Observatory, Santa Cruz, CA 95064, USA.
3. Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA.
4. Department of Astronomy, Ohio State University, Columbus, OH 43210, USA.
5. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA.
6. Department of Chemistry and Physics, Saint Michael’s College, Colchester, VT 05439, USA.
7. Leiden Observatory, Leiden University, NL-2300 RA Leiden, Netherlands.
8. Steward Observatory, University of Arizona, Tucson, AZ 85721, USA.