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Let G be a simple algebraic group of adjoint type over an algebraically closed field k of bad characteristic. We show that its sheets of conjugacy classes are parametrized by G-conjugacy classes of pairs 
$(M,{\mathcal O})$ where M is the identity component of the centralizer of a semisimple element in G and 
${\mathcal O}$ is a rigid unipotent conjugacy class in M, in analogy with the good characteristic case.
