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* Param-example .param amplitude= 1V .subckt myfilter in out rval=100k cval=100nF Ra in p1 {2*rval} Rb p1 out {2*rval} C1 p1 0 {2*cval} Ca in p2 {cval} Cb p2 out {cval} R1 p2 0 {rval} .ends myfilter X1 input output myfilter rval=1k cval=1n V1 input 0 AC {amplitude} .end