Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)   
C  0.044772   0.006844   6.542  0.00726 **
b -5.475070   0.911921  -6.004  0.00926 **
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.8485 on 3 degrees of freedom

Number of iterations to convergence: 9 
Achieved convergence tolerance: 2.107e-06