Consider deleting sad and theoph vignettes because they take time and xGx page demonstrates them and is kept more up-to-date.

[iamstein]

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Package versions (please complete the following information):

• R version [e.g. 3.4.3, 3.6.1 or 4.0.0]
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• xgxr package version [e.g. 0.0.7]

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[iamstein]

This has been done in 1.1.3