Fig. 15

Correlation among the scalar field parameters and the gas density. Spirals are LSB spiral galaxies; the filled squares are clusters of galaxies; filled circle is the elliptical galaxy NGC 4374. Dashed line is the best fit only for clusters; the dotted line is the best fit for spiral galaxies only; the dot-dashed line is the best fit for the total sample. Objects in brackets are the peculiar cases described in the text and not considered in the fits.
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