CST E-field as a function of frequency

Hello,
I have to analyze the behaviour of a circuit in the frequency range from 0.1 to 2 GHz and find the critical values (the frequencies at which the field is maximum) As far as I have seen, I can only plot the spatial field distribution at some specific frequencies (where I define the field monitors) Is there a possibility to obtain (graphically or in a text file or by some post-processing) the E-field values over the whole frequency range?
Thanks!

Use field probes. There is also a Macro or template base processing (can't remember which) to allow you to plot field at multiple points in simulation space vs freq. The down side using field probes will probably only give you text file to work with.