Formula: dd ~ C * diam^b

Parameters:
   Estimate Std. Error t value Pr(>|t|)  
C  0.020518   0.001618   12.68   0.0501 .
b -3.758456   0.289581  -12.98   0.0490 *
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

Residual standard error: 0.1435 on 1 degrees of freedom

Number of iterations to convergence: 5 
Achieved convergence tolerance: 9.252e-07