Nothing

```
# The following function adds information about supplementary variables to any already constructed biplot
# It may serve to add the variables to a Principal Coordinates Analysis (or MDS)
# in order to build a biplot. Unless specified, numerical variables are added with linear regression,
# factors with logistic biplots, frequencies with weighted averages and abundances with gaussian regression.
# If the type of variable is not specified the program tries to guess.
# The type of Variable can be specified in a vector TypeVar and the type of fit in a vector TypeFit.
# If fitting types are not supplied, default values for each type are used
AddSupVars2Biplot <- function(bip, X){
}
```

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