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If the range of the colour spectrum is 0, i.e. there is only one value for the current colour spectrum, then this would previously give a division by 0 in the shader, causing the final colour to become black. This is unexpected and makes the layer view hard to read. Instead, we'll now use the middle of the range then. This was likely a problem for a long time but only really became visible due to the colour spectrum now showing only the range of values for the visible structures. Previously it was a problem e.g. for layer thickness if all layers had the same thickness (i.e. initial layer height == layer height).