A system and method for generating cluster spines is provided. In order to remove this the receiver includes controllable DC offset generators and variable gain amplifiers. The recorder unit also activates the various sensors as necessary to obtain information at certain predetermined intervals to limit battery usage. The substrate may have an outer perimeter and within the outer perimeter the substrate may have a heat-transfer-resisting material-deficient portion proximate to the fusible conductor. The markings can include information representing more than one spatial resolution level and varying between different markings.