Hello, afraid stats was never my strongest maths subject, so hoping someone can help me with this.

I'm fitting a non-linear regression line to some data. The line has the form
y=a0+1.086*(x/a1)^a2
where a0, a1 and a2 are free parameters. I'm currently using the program xmgrace to plot graphs and carry out function fitting. A typical output would be

Fitting with formula: y=a0+1.086*(x/a1)^a2
Initial guesses:
a0 = 1
a1 = 1
a2 = 1
Tolerance = 1e-14
Relative error in the sum of squares is at most tol.
Computed values:
a0 = 19.5413
a1 = 8.41693
a2 = 0.974081

Chi-square: 0.932071
Correlation coefficient: 0.974664
RMS per cent error: 0.00781243
Theil U coefficent: 0.00796977

What I would love to know is would any of the above allow me to calculate the individual errors for each of the parameters?

Thanks for reading,
Rai