Try the following:
set terminal postscript enhanced color
set output 'plot.eps'
set key below
plot sin(x) title "{/Arial=8 LongFunctionKeyName}", \
sin(2*x) title "{/Arial=8 LongFunctionKeyName}", \
sin(3*x) title "{/Arial=8 LongFunctionKeyName}", \
sin(4*x) title "{/Arial=8 LongFunctionKeyName}", \
sin(5*x) title "{/Arial=8 LongFunctionKeyName}", \
sin(6*x) title "{/Arial=8 LongFunctionKeyName}", \
sin(7*x) title "{/Arial=8 LongFunctionKeyName}", \
sin(8*x) title "{/Arial=8 LongFunctionKeyName}", \
sin(9*x) title "{/Arial=8 LongFunctionKeyName}", \
sin(10*x) title "{/Arial=8 LongFunctionKeyName}", \
sin(11*x) title "{/Arial=8 LongFunctionKeyName}", \
sin(12*x) title "{/Arial=8 LongFunctionKeyName}", \
sin(13*x) title "{/Arial=8 LongFunctionKeyName}"
This is the output in gnuplot 4.6:

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