G_ADVECT_SCALAR  1
G_ADVECT_SCALAR_MONO  1
G_ADVECT_SCALAR_PD  1
G_ADVECT_SCALAR_WENO  1
G_ADVECT_SCALAR_WENOPD  1
G_HORIZONTAL_DIFFUSION  1
G_SET_TEND  1
G_SIXTH_ORDER_DIFFUSION  1
G_VERTICAL_DIFFUSION  1
G_VERTICAL_DIFFUSION_MP  1
G_ZERO_TEND  3