set terminal png
set output "plot1.png"
set size 0.8,0.8

set xlabel "Frequency (microHz)"
set ylabel "Amplitude (arbitrary)"
set xrange [500:1500]

plot "spectrum.dat" using 1:2 with linespoints title "FFT"# , \
#     "Data/spec_matlab.dat" u 1:2 w lines title "Matlab"