Tags in the HTC files are replaced with 'nan' even though they are defined in the spreadsheet
Please see Michael K. McWilliam (mimc@dtu.dk), basically there some 'binary switch' tags that expand to nan when the are replaced in the generated htc files. I used a master xls file and master htc file that was created by David, however I did make some changes so maybe it was my mistake. It's probably better that you come visit me to see the problem.