Help with calculator expression when there are multiple components at a frequency

Hi,

I was simulating a multiplier circuit and using HB analysis to check the linearity of the same.

I have two input frequencies at f1, f2 and at the output a lot of the higher order harmonics fall back at the same frequency. 

For example, if f1 is at 3G, f2 at 4G:

If the output is listed in a table form, I would see something like:

freq (Hz)  |  V(V)

3G           |    100m

3G           |    1m

3G           |    0.2m

4G           |    40m

4G           |    0.3m

...

How to take care of this in the calculator expression, if I am only interested in the max value at a particular frequency(in this case 100m @ 3G and 40m @ 4G)?

Thanks in advance,
AT