# set terminal png transparent nocrop enhanced font arial 8 size 420,320 
# set output 'fit.12.png'
set key right below Right noreverse noinvert enhanced box linetype -2 linewidth 1.000 samplen 4 spacing 1 width 0 height 0 autotitles
set title "data with experimental errors" 0.000000,0.000000  font ""
set xlabel "Temperature T  [deg Cels.]" 0.000000,0.000000  font ""
set ylabel "Density [g/cm3]" 0.000000,0.000000  font ""
l(x) = y0 + m*x
y0 = 1.06865074176476
m = -0.000943519626922319
plot 'lcdemo.dat' using 1:2:5 with errorbars
## fit l(x) 'lcdemo.dat' using 1:2:5 via y0, m