You've put it in the wrong place. As I said above, this needs to go on Simulation->Options->Analog - in the additional parameters (at the bottom in IC5141, and in IC61X I think it's on the Misc tab). Rather than specifying it as a global option (see "spectre -h options") you've tried to add it as a parameter to the tran analysis, and that doesn't make sense. Andrew.
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