Why not try to avoid binning (and density plot) at all? An alternative 
could be a qqplot (as a log-log-plot), e.g.

plot(ppoints(length(x4)), x4[order(x4)], log="xy")
abline(lm(log(x4[order(x4)])~log(ppoints(length(x4)))), col="red")

If the assumptions of uniform distribution and power transformation 
y=a*x**b are true, the coefficient of lm estimates the exponent b.

Herwig

-- 
Dr. Herwig Meschke
Wissenschaftliche Beratung
Hagsbucher Weg 27
D-89150 Laichingen

phone +49 7333 210 417 / fax +49 7333 210 418
email [EMAIL PROTECTED]

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