"bowers_seis" notebook - error message running Pressure Prediction with Bowers method:

[salsa360]

Hi Yu Hao,

I've tried running your "bowers_seis" notebook and keep getting the following error when trying to view
the fitted density trend:

RuntimeWarning: invalid value encountered in power
return ((v-v0)/a)**(1/b)
OptimizeWarning: Covariance of the parameters could not be estimated
category=OptimizeWarning)
RuntimeWarning: Implicit conversion from float64 to float32 (narrowing)
warnings.warn(msg.format(x.dtype, dtype), RuntimeWarning)