If charge is surface* effect, and mass a 'volume' effect, you might expect a ratio of 1.0/(0.5^[1/3]). This is 1.26 (or 0.79). Does not seem to fit experiment,

If charge is surface* effect, and mass a 'volume' effect, you might expect a ratio of 1.0/(0.5^[1/3]). This is 1.26 (or 0.79). Does not seem to fit experiment, even when fiddling with error bars. OK, so no volume vs surface effect then. *Suppose that both gluon and quarks are really in the exact same region, but that the 'effective' behaviour is "on the surface" for one of them, while "in the whole volume" for the other. In three dimensions, the "effective" radio would differ, in one it would be a factor (0.5)^(1/3) smaller.