Left: comparison between the continuum-based and the line ratio-based E(B − V) values of red quasars. The values are composed of and values. The and are represented by the circles and squares, respectively. The values are adopted from previous studies (Glikman et al. 2007; Urrutia et al. 2009), for which uncertainties for some of the values are not available. The red and blue colors indicating the values are adopted from Urrutia et al. (2009) and Glikman et al. (2007), respectively. The arrows representing the values are measured using the upper limits luminosities of Hβ and L_{P β}, and their colors have the same meanings. The dashed line indicates a line where the two values are identical. The correlation between these two quantities are nonexistent, suggesting large uncertainties that are associated with the determination of the dust extinction from the continuum that may be affected by the modeling of the continuum components. Right: the vs. . The meaning of the circles, square, and arrows are identical to the left panel. The values are adopted from Glikman et al. (2007), and they agree well with the .