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gnuplot> plot '< tail -n 40 c:/test/bitgbp1.dat'  using 3:2:((delta_v(
+$2) > 0.0) ? 1 : -1 )with impulses lw 2 palette
                                                                      
+                                        ^
         warning: Skipping data file with no valid points
                                                                      
+                                               ^
         x range is invalid

gnuplot> pause 10
{"success":false,"error":"Service temporarily unavailable"}
...
gnuplot> replot;
         ^
         no previous plot

#!/usr/bin/perl -w
use LWP::Simple;
...
pause 10
reread
replot;