ml_u: eastward wind
ml_v: northward wind
ml_sigdot: sigma-vertical velocity 
ml_psi: mass stream function
ml_t: temperature 
ml_theta: potential temperature
ml_thetae: equivalent potential temperature
ml_thetaesat: saturation equivalent potential temperature
ml_brunt: stability 
ml_q: sprcific humidity
ml_qsat: saturation humidity
ml_rh: relative humidity
ml_phi: geopotential height
ml_qcnd: condensation heating
ml_qradl: longwave heating
ml_qrads: shortwave heating
ml_qvdf: diffusive heating
ml_scnd: condensation moisting