# general
set grid
set autoscale
set datafile missing '<?>'


# x axis
set autoscale x
set xtics
set xdata time
set timefmt "%Y-%m-%d_%H:%M"


# plot
plot 'gnumed-lab.dat' using 3:4:(valid(5) ? column(5) : $4):(valid(6) ? column(6) : $4):xticlabels(2) index 0 with yerrorbars
# detect and adjust x range and replot
set xrange [(GPVAL_X_MIN - 43200):(GPVAL_X_MAX + 43200)]
replot