esp-idf/docs/_static/diagrams/spi/spi_master_freq_tv.plt

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Gnuplot
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# this is a GNUPLOT script generating the figure of spi_master_freq_tv.png
set xlabel "Input delay (ns)"
set xrange [0: 125]
set ylabel "Fmax (MHz)"
set yrange [0: 81]
set xtics 12.5 textcolor rgb "black"
set ytics 10 textcolor rgb "black"
set border 3 lc rgb "gray" lw 2
set grid lt -1 lc rgb "gray" lw 2
set samples 10000
set terminal png size 700,500
set output "plot.png"
apb = 12.5
#each line is broken into 10 pieces by the range determined by i
f1(i,x) = (x>= i*apb) && (x < (i+1)*apb) ? 80./(i+1) : 1/0
set style circle radius graph 0.008
#solid and empty circles are draw by the coordinates given in the csv
plot [0:125]\
f1(-1, x) lw 3lc rgb "blue" title "IOMUX",\
for [i=0:9] f1(i, x) with lines lw 3 lc rgb "blue" notitle,\
f1(0, x+25) lw 3 lc rgb "red" title "GPIO",\
for [i=2:11] f1(i, x+25) with lines lw 3 lc rgb "red" notitle, \
"tv.csv" using 1:2 with circles notitle fill solid fc rgb "blue", \
"tv.csv" using 1:4 with circles notitle fc rgb "blue",\
"tv.csv" using 1:3 with circles notitle fill solid fc rgb "red" ,\
"tv.csv" using 1:5 with circles notitle fc rgb "red"