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The thermodynamic upper critical field $H_{c2}$ lines has been deduced from $C_p$ measurements up to 28 T for both $H\\|c$ and $H\\|ab$, and compared to the lines deduced from transport measurements (up to 55 T in pulsed magnetic fields). We show that this {\\it thermodynamic} $H_{c2}$ line presents a very strong downward curvature for $T \\rightarrow T_c$ which is not visible in transport measurements. 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