function TTdot = ex83(x, TT)
%
% this file defines the steady state eqs. in Eqs.(8.3.1) and (8.3.3)
% by removing the time derivative terms.
% TT(1) = Tt, TT(2) = Ts;
%

global Pt Ps Vt Vs;

TTdot(1) = Pt*(TT(2)-TT(1))/Vt;
TTdot(2) = Ps*(TT(2)-TT(1))/Vs;
