First 3D GNUPLOT of Big Dongle Array Data

set xlabel "Time" font "arial,8"
set ylabel "Frequency (Hz)" font "arial,8"
set zlabel "Gain (dBm)" font "arial,8"

set grid lc rgbcolor "#BBBBBB"
set timefmt '%Y-%m-%d %H:%M:%S'
set format y "%f"

#set xrange[-180:180]
set yrange[28.000:29.000]
set zrange[-60:0]

unset key
set view 30,56,0.98
set format x "%H:%M"
set xdata time
set datafile separator ","

splot '/tmp/test.out' u 1:2:3 with pm3d