| noData | error  | 
|   | This error occurs when the data set does not appear to be empty. Note that this may also be due to a wrongly formatted input set (e.g. no instrumental summary lines).   | 
| tooManySets | warning  | 
|   | The number of input data sets to be merged exceeded the maximum number (currently set to 9).
 corrective action: Only the first 9 number of input sets are processed.   | 
| noMatchingSources | warning  | 
|   | Normally one expects at least some of the sources in two input data sets to overlap, if this is not the case this warning message appears.
 corrective action: The input sets should be checked by hand/eye whether the two should actually be merged together.   |