Methods and systems have been provided for removing dead Access Control Entries in an Access Control List. More particularly, fibrous structures comprising two or more regions, at least one of which exhibits a density that is at least 1. The halogenated phthalocyanine can have the formula: nMLo, where each R is, independently, a halogen or a perhaloalkyl group, with each R group being independent from the other groups; Pc is a phthalocyanine compound; 1\u2266n\u22662; L is a ligand or ligands and M is a cation; and 0\u2266o\u22668. The signal conditioning circuit generates an analog signal based on a sensor signal and based on the control signal.