Function margin 

pub fn margin(
    aero: &AeroModel,
    flow: &Flow,
    cg_station_m: f64,
) -> Result<Margin, SimError>

The margin of aero in flow with the center of mass at cg_station_m (m aft of the nose tip). See Margin and MARGIN_CONDITION_LIMIT for when it is None.

Errors

The aerodynamic model’s, for a flow outside its range.