GNUPlot

set terminal epslatex color size 15cm,12cm
set output 'graphLab1.tex'
set xlabel '$f$\,, Гц'
set ylabel '$|K|$'
set title 'Зависимость коэффициента передачи от частоты'
set xrange[10:3000]
set yrange[0:1.1]
set grid ytics lc rgb '#555555' lw 1 lt 0
set ytics 0,0.1
set mytics 2
set grid xtics lc rgb '#555555' lw 1 lt 0
set logscale x

f(x)=a*atan(b*x+c)+d
fit f(x) 'data' using 1:2 via a,b,c,d

plot 'data' using 1:2 notitle with point pt 82, f(x) title '$|K(f)|$' with line lt 1 lw 3 lc rgb '#333333'
set output