Under the present invention, data corresponding to an enterprise architecture is first gathered. The head comprises a magnetic pole, a waveguide propagating light, and a NFL-generator coupled with the light in surface plasmon mode. First and second data drivers are provided for each column of pixels. A block boundary between the first block and the second block is characterized. The amplification may be set via the supply voltage of the secondary-electron multiplier and can be increased or decreased by a desired factor using the known characteristic of the secondary-electron multiplier. For example, the temperature-sensitive voltage divider may be a thermistor voltage divider.