Awk usage to give x and y axis label names

Hi everyone
I am using the awk command to plot the coverage depth and I can generate the plot. However, while I am trying to provide label names for both axis it is not working.
here is the cmd line that I am using. Please let me know if you have any suggestions.

awk '{OFS="\t"; print $2, $3}' JC_nodup_Sample_002.txt | gnuplot -e "set terminal png; set output 'coverage_histogram_002_v2.png'; plot '-' with lines"

This command I used to plot

and this command I am using to give the headings

awk '{OFS="\t"; print $2, $3}' JC_nodup_Sample_002.txt | gnuplot -e "set terminal png; set output 'coverage_histogram_002_v2.png'; set xlabel 'X_Label'; set ylabel 'Y_Label'; plot '-' using 1:2 with lines title 'Position', '' using 1:3 with lines title 'Coverage Depth'"

Please let me know where I am making a mistake.
Thanks in advance.

@OS_1990 (ok, a few too many days to respond ... but here's a simple gnuplot script that (more or less) shows what you're after .... )

10	87.3
20	99.8
30	85.2
40	92.1$
50	78.4$
60	91.7
70	82.9
80	89.0

cat myplot.cmds 
set terminal png
set output 'test.png'
set xlabel 'X-LABEL'
set ylabel 'Y-LABEL'
set title 'Position'
plot 'test.data' using 1:2 with lines

gnuplot <myplot.cmds

this link may help you on your journey ... (there are others ... )
gnuplot examples

hope this is of some help.