Herschel Survey of Galactic OH+, H2O+, and H3O+: Probing the Molecular Hydrogen Fraction and Cosmic-Ray Ionization Rate
arXiv: 1412.1106 · Summary page · arXiv
What changed between two versions of a paper. Changed results and numbers (before and after), conclusions, method, data, errors fixed, or only the writing, and whether the main results changed. And an email when a paper you follow gets a new version.