Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)  
C  0.048411   0.003129   15.47   0.0411 *
b -3.123514   0.229517  -13.61   0.0467 *
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.3074 on 1 degrees of freedom

Number of iterations to convergence: 5 
Achieved convergence tolerance: 1.339e-06