5.1 Environment setting for accumulations

Before invoking the check_expconf or concatenate or command one shall notify the system on which disk directory FOT files reside, and what SAX instrument has to be analysed.

This is done setting (at least) the following environment variables (the first two shall already have been set before FOT filing) :

```
xasset rootdir abspath
```
```
xasset fotdir  path
```
```
xasset printdir  path
```
```
xasset instrument instrument
```

Before invoking any of the accumulation commands one shall notify the system on which disk directory FOT files reside, what SAX instrument has to be analysed, and where XAS has to create or look for data files.
In addition one may want to set instrument specific corrections or to establish time windows

This is done setting (at least) the following environment variables (the first four shall already have been set in advance) :

xasset rootdir abspath
xasset fotdir path
xasset printdir path
xasset instrument instrument
Consult the separate tutorial on the location of XAS data files.
```
xasset datadir path
```
[xasset target anystring]
[xasset date anystring]
[xasset order order]
Consult the separate tutorial on instrument specific corrections.
[xasset correction Enabled]
[xasset gainhistory gainfile]
[xasset selectfile selfile]
[xasset selectmethod method]
```
[xasset timewindow wfile]
```

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