An apparatus and method for cataloging symbolic data for use in performance analysis of computer programs is provided. The methods can be used to backflush a sample to a desired fluid flow path to select certain analytes within a sample. Further, a gas discharge lamp is in operative connection to the lamp input line configured to receive the asymmetric alternating current. At least a portion of the intermediate guideline member is positionable adjacent the golf hole and rotatable thereabout so as to allow the first and second guideline members to collectively define the first and second boundaries for the point of entry and for identifying the breaking point.