Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)    
C  0.069786   0.002632   26.51 0.000118 ***
b -3.422480   0.097004  -35.28 5.01e-05 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.2432 on 3 degrees of freedom

Number of iterations to convergence: 6 
Achieved convergence tolerance: 9.37e-07