With given values
Vds = 50mV
Vgate = 600mV

betaeff = 7.639
cgs = -13.66f
gds = 3.405m
vth = 374.7m
ids = 193.9u
gm = 823.8u
W = 10mu
L =  0.2mu

Vov = Vgs-Vth = Vth_d (in the result display window)
We get 225.3m, close enough, NO!
Change Vgate to 624m

Now Vov, vth_d is 249.3mV
betaeff = 23.34m
cgs = -13.7f
gds = 3.796m
vth = 374.7m
ids = 213.6u
gm = 817.8u
W = 10mu
L =  0.2mu

In which region???
Vds > Vov; Vgs > Vth -> Saturation, changing Vds wont do much, mosfet delivering high current
Vds < Vov; Vgs > Vth -> Triode (Linear), delivering current in linear relationship to Vds
Vgs < Vth -> Cutoff, MOSFET not delivering any current

We have 
Vgs = 624mV
Vov = 250mV
Vth = 374.7mV
Vds = 50mV
Thus we are in the Linear region