How the "region" operating Point is determined by Spectre ADE

Dear All,

For typical long channel, the condition for the saturation (active) region of NMOS is VDS > ( VGS-VTh).

For short channel we can use vdssat for determining the active region of NMOS i.e. NMOS is in active region if VDS > vdssat.

Can anybody please tell how Spectre determines the region (particularly Active i.e. region-2) for NMOS ?

Kind Regrads,