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It works, thank you!

I am using the Version 3.141592-1.40.3
I tried a simpler case with a \documentclass[]{article}, and it works.
When I make a poster, I use \documentclass[]{sciposter}, and it does not work anymore. Apparently, it has something to do with this sciposter...
I also use the command \section*{}, which ...

Thanks for your quick answer and for your help.
I tried what you've suggested but it unfortunately does not work. Here is the message I get:

! LaTeX Error: \ContinuedFloat outside float.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
..
l.55 \caption ...

I am making a poster with sciposter.
I would like to add a legend to my pictures, without getting the number of the figure. I usually use \caption but I do not manage to eliminate the "Figure 1:" and to keep the following text.
My question is thus: how can I title my figures without getting a number ...