 phases.
%
%% Methods
% * *saturationDegree*: Computes the liquid saturation degree based on 
%                       the capillary pressure pc.
% * *permeabilityMtrcs*: Computes the permeability matrices for the liquid
%                        and gas phases based on the liquid saturation 
%                        degree Sl, liquid pressure pl, and gas 
%                        pressure pg.
% * *permeabilityMtrcsPgPc*: Computes the permeability matrices for the
%                            liquid and gas p