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The following remark in parentheses p.2 (i.e. p.2670 of the 
published version), is misleading:

"It turns out that one may replace the fundamental group here by 
the wild fundamental group of Martinet-Ramis [11] (abstractly 
this is just the Tannaka group of the Tannakian category of 
meromorphic connections on vector bundles on Sigma)."


It should be replaced by:

"It turns out that one may replace the fundamental group here by 
the wild fundamental group of Martinet-Ramis [11] (a natural 
generalisation of the fundamental group of the punctured curve, 
whose pro-algebraic completion is the Tannaka group of the 
Tannakian category of algebraic connections on vector bundles on 
the punctured curve, cf. [11] p.395)."

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