[Gnuplot-info] Series labels from data file?

[Steve C. <sc...@ja...>]

Given the following dataset

2009-04    OFF    67935    248967.45    0
2009-05    OFF    35693    131338.02    0
2009-06    OFF    118    599.07    0
2009-10    OFF    1    0.63    0


2009-04    NEW    1627    5566.72    1
2009-05    NEW    737    4996.18    1
2009-06    NEW    414    1902.48    1
2009-07    NEW    79    232.22    1
2009-08    NEW    119    248.03    1
2009-09    NEW    122    190.87    1
2009-10    NEW    97    67.92    1


2009-05    VERIFIED    1061    6909.02    10
2009-06    VERIFIED    3690    27681.30    10
2009-07    VERIFIED    1842    13867.37    10
2009-08    VERIFIED    1894    13529.98    10
2009-09    VERIFIED    1433    10401.02    10
2009-10    VERIFIED    1916    10619.17    10


2009-06    CERTIFIED    17    185.33    11
2009-07    CERTIFIED    163    1067.47    11
2009-08    CERTIFIED    127    1037.75    11
2009-09    CERTIFIED    118    1148.42    11
2009-10    CERTIFIED    532    2301.32    11

I'd like to get the series titles from Column 2.  Also, the double line 
feeds between series were added manually.  It would be nice if I didn't 
have to do that and could trigger a new series based on the contents of 
column 2.  Are either of these things possible.

Since I can't do either of these I am doing instead

set xdata time
set timefmt "%Y-%m"
set format x "%m/%Y"
plot "datafile" index 0 u 1:4 t "OFF" with linespoints, \
"" index 1 u 1:4 t "NEW" with linespoints, \
"" index 2 u 1:4 t "VERIFIED" with linespoints,
"" index 3 u 1:4 t "CERTIFIED" with linespoints