The present invention relates to spindle-shaped goethite particles having an average major axial diameter of 0. The detection is performed using a threshold value to determine equivalence between a pair of fields of digital video data. In some embodiments, the tool determines what type and how many wireless systems are to be configured prior to configuration of any of the systems. The second pilot valve apparatus is coupled to the junction to facilitate flow of water through the second pilot valve apparatus when the second differential valve member is in an open position. The advertising model determines which data sets are to be retrieved based on the query. The loss probability can be estimated for individual packets to follow rapid changes in communication conditions.