From (complete_reference):
Bxxx n1 n2 V=<expression>
Bxxx n1 n2 I=<expression> [Rpar=<value>] *[Cpar=<value>]
+ [[ic=<value>] tripdv=<value>] [tripdt=<value>]
+ [Laplace=<func(s)> [window=] [nfft=<num>] [mtol=<num>]]
* + [[units] Freq=<valuelist> [delay=<value>]] <=================
* + [NoJacob]
* Bxxx n1 n2 R=<expression>
* Bxxx n1 n2 P=<expression> [VprXover=<value>]
-marcel
