@olamundo

array data[4] = [-2, 3.14159, 3.5, 4.2]
set xrange [-5:5]
set yrange [-1:1]
set style fill solid
set border 0
set xzeroaxis
unset ytics
set xtics nomirror
unset key
set size 1, 0.3
set xtics axis
do for [i = 1:4] {
set object i circle at data[i], 0 fc "blue" size 0.05
}
plot NaN