Embodiments related to calculating node centralities in large and complex networks and graphs. The bar comprises a bracket releasably mounted, in use, to said treatment bed. A laying pipe is received in the through passageway. A film of thermo-resist composition applied to the substrate surface is scanned by a focused heat source in a predetermined pattern, without a phototool, to bring about localized thermally-induced chemical transformations of the composition which either directly produce the resist pattern or produce in the film a developable latent image of the pattern. The invention further relates to a computer program, a computer program product, a device and a system. One method provides a reproduced luminance value higher than the sum of the respective luminance values of the three components of the input signal when reproduced with the gamut-defining emitters.