corner simulation

[fred]

Hi friends,

I have tried to conduct corner simulation and wanna to see the performance
of iip3.

I am using the following expression in the output
ipnVRI(v("/net0143" ?result "qpss_fi) '(-1 2) '(0 1) ?ordspur 3 ?epoint -50
?rport 50)

When I simulate with ONE corner, the result can be plotted automatically.
When I simulate with 2 corners or more, then cadence claimed such expression
is invalid.

Can you tell me what's the reason?

Thanks,
Fred