set terminal png
unset key
set pointsize 0.5
set fit errorvariables

z(x) = 0

# 
set output "residualplot.png"
set ylabel "Normalized Residuals"

unset label

set xrange [0:*]
set yrange [*:*]
plot "residuals1.txt" with yerrorbars pt 12, z(x) with dots lw 4