```
FT_DETERMINE_COORDSYS plots a geometrical object, allowing you to perform
a visual check on the coordinatesystem, the units and on the anatomical
labels for the coordinate system axes.
Use as
[dataout] = ft_determine_coordsys(datain, ...)
where the input data structure can be
- an anatomical MRI
- an electrode or gradiometer definition
- a volume conduction model of the head
or most other FieldTrip structures that represent geometrical information.
Additional optional input arguments should be specified as key-value pairs
and can include
interactive = string, 'yes' or 'no' (default = 'yes')
axisscale = scaling factor for the reference axes and sphere (default = 1)
clim = lower and upper anatomical MRI limits (default = [0 1])
This function wil pop up a figure that allows you to check whether the
alignment of the object relative to the coordinate system axes is correct
and what the anatomical labels of the coordinate system axes are. You
should switch on the 3D rotation option in the figure panel to rotate and
see the figure from all angles. To change the anatomical labels of the
coordinate system, you should press the corresponding keyboard button.
Recognized and supported coordinate systems include: ctf, 4d, bti, itab,
neuromag, spm, mni, tal, acpc, als, ras, paxinos.
See also FT_VOLUMEREALIGN, FT_VOLUMERESLICE, FT_PLOT_ORTHO, FT_PLOT_AXES
```