global N N_p N_fp N_faces NODETOL; % N_fp - number of points on 1 face - for 1D equal to 1
global P E N_v K x;
global r V invM D_r LIFT;
global J r_x;
global n_x Fx Fscale Fmask;
global EtoE EtoF;
global vmapM vmapP vmapB mapB;
global vmapI vmapO mapI mapO;
global alpha_flux;
global dt N_steps;
global rk4a rk4b rk4c;

% Advection1D problem related variables
global a_advec RHS IC BC;