# Attribute 'small' is useful for gnuplot/-scroll only,
# if plotsize is less than 800,400
#set terminal png transparent small size <SIZE> crop

set terminal png transparent size <SIZE> crop

set output '<OUT>.png'
set xdata time
set timefmt "%Y-%m-%d_%H:%M:%S"
set xlabel " "
set ytics nomirror
set y2tics
#set ytics
set title '<L1>'
set grid xtics y2tics

set y2label "Temperature in C"
set ylabel "Humidity (%)"

#FileLog 4:T\x3a:10:
#FileLog 4:H\x3a:50:

plot \
  "< awk '/T:/ {print $1, $4}' <IN>"\
     using 1:2 axes x1y2 title 'Measured temperature' with lines lw 2,\
  "< awk '/H:/ {print $1, $4}' <IN>"\
     using 1:2 axes x1y1 title 'Humidity (%)' with lines lw 1\