This application is related to the following co-pending applications, of the inventor, filed on even date herewith: Application Ser. This modular design provides flexibility in use and maintenance, as well as in removal and re-use. Models for each type of bond structure are processed on the population of loans until either an optimal bond package is found or a user determines that a solution of sufficient high quality is found. If the CPU finds that the output value exceeds the pre-set threshold value, it verifies whether or not there is any vacant area in a memory card 13. The inter-element line length as a length of the feed line between each succeeding two of the radiating element sections is longer than the arranging interval in the first direction. A secondary chamber has a secondary sensor for sensing a different property of a sampled air stream.