Dear Danny,

You can either 1) apply raw data with the -trans option, and average 
both raw files,
or 2) average both files first, transform the latter into the frame of 
the former average, and average both sets.

MaxFilter does not remove HPI or isotrak information, but apparently you 
average the data in graph?
Graph does not store the isotrak points, but you could try the off-line 
averager (MaxFilter GUI or /neuro/bin/util/maxave).

Best regards, Jukka Nenonen


Danny Mitchell wrote:
> Hello,
> 
> I have two data sets (without cHPI) from each subject, which I want to
> average together. My plan was first to transform the data into a common
> space using the 'trans' option of MaxMove, for example:
> /neuro/bin/util/maxfilter -f data_2.fif -o data2_sss.fif -trans data1.fif
> -autobad 30 -in 8 -out 3 -ds 4 -format short 
> 
> My problem is that when I open the output (after reaveraging) in xfit, I am
> told that there is no isotrack data to which I can fit a sphere model. I
> don't have this problem if I remove the 'trans' parameter.
> 
> Does the 'trans' option remove any isotrack data? Am I doing something wrong?
>   
> Sorry if this is a naive question. Any suggestions would be appreciated.
> Danny


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