  Given a 2-crossing minimal chart $\Gamma$, a minimal chart with two
crossings, set $\alpha=\min\{~i~|~$there exists an edge of label $i$ containing
a white vertex$\}$, and $\beta=\max\{~i~|~$there exists an edge of label $i$
containing a white vertex$\}$. In this paper we study the structure of a
neighbourhood of $\Gamma_\alpha\cup\Gamma_\beta$, and propose a normal form for
2-crossing minimal $n$-charts, here $\Gamma_\alpha$ and $\Gamma_\beta$ mean the
union of all the edges of label $\alpha$ and $\beta$ respectively.
