There's no way to do it completely linearly, but you can do it in small discrete steps without having to define all the individual steps by using the param_step parameter (see "spectre -h tran") which can be specified via the Additional Arguments field on the Transient Options form (misc tab, I think). The idea is that if you have one value at 10u and another and 50u, and set param_step=1u, it would make 1/40th of the overall step each 1u. Regards, Andrew.
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