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This should be an easy question but since few examples are given for
ShowLegend and I am a new user, I got stuck after many attempts.
I plot three graphs which are seperately defined as
t3. In each graphs there are one or two curves (Original codes to yield the graphs are complicated and not important).
Then I present them in one graph, coding
graph1 = Show[t1, t2, t3, PlotRange->All]
Now I would like to add texts for identification for each curve in the graph1, in a form like
--- x=2 ___ x=3 ''' x=4
Since the graph1 has already been plotted,
PlotLegend may not work.
ShowLegend but don't know how to establish the codes.
Many thanks in advance.