Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)  
C  0.026260   0.006137   4.279   0.0505 .
b -2.346585   0.529985  -4.428   0.0474 *
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 1.877 on 2 degrees of freedom

Number of iterations to convergence: 13 
Achieved convergence tolerance: 9.49e-06