The Sun has a spectral type of G2.

    Q:  What is the (B-V) color of the Sun?

            (B-V)  is approximately +0.6


    Q:  What is the temperature of the Sun?

            On the vertical axis, we see that the logarithm of
            the Sun's temperature is about 3.76.  Thus,


                T  =  10^(3.76)   =   5750  Kelvin