I did not understand the following segment of code used in the array_processing source file.

```
# generate plan for rfftr
nfft = next_pow_2(nsamp)
deltaf = fs / float(nfft)
nlow = int(frqlow / float(deltaf) + 0.5)
nhigh = int(frqhigh / float(deltaf) + 0.5)
nlow = max(1, nlow) # avoid using the offset
nhigh = min(nfft // 2 - 1, nhigh) # avoid using nyquist
nf = nhigh - nlow + 1 # include upper and lower frequency
# to speed up the routine a bit we estimate all steering vectors in advance
steer = np.empty((nf, grdpts_x, grdpts_y, nstat), dtype=np.complex128)
clibsignal.calcSteer(nstat, grdpts_x, grdpts_y, nf, nlow,
deltaf, time_shift_table, steer)
_r = np.empty((nf, nstat, nstat), dtype=np.complex128)
ft = np.empty((nstat, nf), dtype=np.complex128)
newstart = stime
# 0.22 matches 0.2 of historical C bbfk.c
tap = cosine_taper(nsamp, p=0.22)
```

If I have frqhigh=0.1 Hz, with the above code segment, the code wouldn’t run properly right? I am really lost about what’s done here. Any help would be appreciated.

Thank you