-ve amplitude value in wx fft sink spectrum

Respected members
I am new in GNU radio and i just want to share about one problem i came
across related to the WX FFT SINK spectrum i.e. how can i get +ve
amplitude
values of the fft spectrum(signal amplitude)? The values i got were
always -ve (the spectrum is shown below the 0 db amplitude)whatever the
flow grapths were. This question might had been discussed earlier but
anyone plz suggest me what can be the solution. Which parameter should i
need to change?

regards
pitter

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