Bayesian transD inversion with parallel tempering as described in 
1. Ray, A. & Key, K. Bayesian inversion of marine CSEM data with a trans-dimensional self parametrizing algorithm. Geophys. J. Int. 191, 1135–1151 (2012) 
and 
2. Ray, A., Alumbaugh, D. L., Hoversten, G. M. & Key, K. Robust and accelerated Bayesian inversion of marine controlled-source electromagnetic data using parallel tempering. Geophysics 78, E271–E280 (2013).