Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)   
C  0.040310   0.005463   7.379  0.00515 **
b -4.948606   0.640343  -7.728  0.00450 **
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.7646 on 3 degrees of freedom

Number of iterations to convergence: 9 
Achieved convergence tolerance: 6.948e-06