Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)    
C  0.031404   0.001478   21.24 0.000228 ***
b -4.271048   0.146479  -29.16 8.86e-05 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.2544 on 3 degrees of freedom

Number of iterations to convergence: 6 
Achieved convergence tolerance: 7.315e-07