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1 mm unit
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\LabelTeX 2 4 $M$ \ELTX
\LabelTeX 28 15 $U_\alpha$ \ELTX
\LabelTeX 22.5 26.5 $\scriptstyle U_\alpha\cap U_\beta$ \ELTX
\LabelTeX 26 38 $U_\beta$ \ELTX
\LabelTeX 58 42 $\tau_\beta$ \ELTX
\LabelTeX 58 19.5 $\tau_\alpha$ \ELTX
\LabelTeX 65 -3 $\bR^m$ \ELTX
\LabelTeX 90 8 $V_\alpha$ \ELTX
\LabelTeX 93 59.5 $V_\beta$ \ELTX
\LabelTeX 79 18.8 $\scriptstyle\tau_\alpha(U_\alpha\cap U_\beta)$ \ELTX
\LabelTeX 83 47.5 $\scriptstyle\tau_\beta(U_\alpha\cap U_\beta)$ \ELTX
\LabelTeX 91 33 $\tau_{\alpha\beta}$ \ELTX
\EndFig