Single INTEGRATION_NODE TRACK_NODE_SINGLE(T,X,K)

This is the fundamental routine that tracks through a single INTEGRATION_NODE fully consistant with the FIBRE. It has no radiation, no spin and no modulation. It does not reset the stability flags: user must do that on his own if he elects to use this routine in a piece of code.

• T is a INTEGRATION_NODE.,
• X is an array of initial conditions and final upon return.
• K is an INTERNAL_STATE.