Systems and methods are disclosed for recording density variation of data tracks. The method and the apparatus further provide for determining the parasitic capacitance while employing the conductor layer actual dimensions and spacings. These coils desirably are situated downstream of an illumination lens. The method and apparatus can efficiently manufacture the evaluation reference tape. A prioritized measurement site is determined when the confidence data for one or more dies is not within the confidence limits. Upon finding a corresponding XTA rule set, the transcoding proxy server follows the instructions of the rule set in order to transcode the requested web page for the device having limited display capabilities.