the final mle estimates are :
coefficient standard-error t-ratio
beta 0 0.23464205E+06 0.10007233E+01 0.23447244E+06
beta 1 0.22724368E+01 0.35504294E+00 0.64004562E+01
beta 2 0.64783527E+01 0.59439057E+00 0.10899151E+02
beta 3 0.82657805E+00 0.76009894E-01 0.10874611E+02
sigma-squared 0.23590803E+12 0.10000000E+01 0.23590803E+12
gamma 0.73925688E+00 0.36836603E-01 0.20068541E+02
mu is restricted to be zero
eta -0.68763199E-01 0.16667421E-01 -0.41256052E+01
log likelihood function = -0.15392895E+04
LR test of the one-sided error = 0.51730814E+02
with number of restrictions = 2
[note that this statistic has a mixed chi-square distribution]