Media type: E-Article Title: High-resolution Observations of H α $\alpha$ Spectra with a Subtractive Double Pass Contributor: Beck, C.; Rezaei, R.; Choudhary, D. P.; Gosain, S.; Tritschler, A.; Louis, R. E. Published: Springer Science and Business Media LLC, 2018 Published in: Solar Physics, 293 (2018) 2 Language: English DOI: 10.1007/s11207-018-1252-2 ISSN: 0038-0938; 1573-093X Keywords: Space and Planetary Science ; Astronomy and Astrophysics Origination: Footnote: