Erratum: Further Simultaneous Observations of the Optical and X-Ray Spectra of SCO X-1 Mark, Hans ; Price, R. ; Rodrigues, R. ; Seward, F. ; Swift, C. ; Hiltner, W. Abstract Publication: The Astrophysical Journal Pub Date: November 1969 DOI: 10.1086/180449 Bibcode: 1969ApJ...158L.131M