Log, as a function of log(L_r/L_⊙) for the Arecibo and Nançay samples within the Arecibo sample’s declination range. Excluded are sources that were clearly confused or had unreliable photometry. Nançay detections, marginals, and nondetections are represented by gray dots, open gray circles, and open red circles respectively. Arecibo detections, marginals, and nondetections are respectively represented by black solid stars, open stars, and blue downward triangles.