/// Incoming particle
pub const INCOMING: i32 = -1;
/// Outgoing final state particle
pub const OUTGOING: i32 = 1;
/// Intermediate space-like propagator defining an x and Q^2 which should be preserved
pub const INTERMEDIATE_SPACELIKE: i32 = -2;
/// Intermediate resonance, mass should be preserved
pub const INTERMEDIATE_RESONANCE: i32 = 2;
/// Intermediate resonance, for documentation only
pub const INTERMEDIATE_DOC: i32 = 3;
/// Incoming beam particles at time t = −∞
pub const INCOMING_BEAM: i32 = -9;