in spectre manual
The device region is If
breakdown ■ bvsub is given and VCS >= bvsub
■ bvbe is given and VBE <= bvbe
■ bvce is given and VCE >= bvce
saturation VBE > vbefwd and VBC > vbcfwd
reverse VBC > vbcfwd and VBE <= Vbefwd
off none of the above conditions are true
no description for "fwd", but I think it should be
fwd VBE > vbefwd and VBC <= vbcfwd