plot of S-parameter

Hello to all,

does someone know if exist a package for plotting S-parameters data from 
files 
.s1p and .s2p (see 
http://na.tm.agilent.com/plts/help/WebHelp/FilePrint/SnP_File_Format.htm).

In particular, in .s1p file, I have three columns: (f,a,b),
and I need to plot (f,z) where z:=20*log10(abs(a+i*b)).

Thank you in advance for any hint

best regards

ENRICO TONIOLO







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