& btengrate_ref()
 
  Syntax: btengrate_ref(<UnitRef>)
 
  This function returns a space delimited string detailing the 
  enginesize and susp_factor for the specified 'reference' unit - ie 
  the default templated value.
 
  Error Messages:
 
  * If the object specified in <UnitRef> is not a valid reference 
    then function returns #-1 INVALID REF 
 
  Example:
  Given that EXT-4D is a valid reference:
 
  > think btengrate_ref(EXT-4D)
  390 0
 
  See Also: btengrate 