Example of how to convert "testda3_keys" to a .mat file:

>> [nkey,stn,calls,tim,lat,lon,dflg] = getkeys('ftestda3_keys');
>> save testda3_keys nkey stn calls tim lat lon dflg
 

Note:
- Substitute the filename of your current keys file where appropriate
- You must use the variable names as above
- You do not have to convert these files; "getstats" will use a .mat file
  version if it is there, otherwise it will use the old version.