Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)   
C  0.069637   0.002465   28.25  0.00125 **
b -3.702363   0.122821  -30.14  0.00110 **
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.285 on 2 degrees of freedom

Number of iterations to convergence: 5 
Achieved convergence tolerance: 7.043e-06