Thank you Ilai. Problem solved. There is a small detail, alpha affects the
rug and the curve line opacity too. Is possible to specify it just to
polygon?

Bests.

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Walmes Marques Zeviani
LEG (Laboratório de Estatística e Geoinformação, 25.450418 S, 49.231759 W)
Departamento de Estatística - Universidade Federal do Paraná
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