A test image of linear gradients covering the whole hue range in svg. Requested to look at what happened to it, because the accuracy lowered much from the original upload. Reducing the number of decimals only resulted in nodes moving, which doesn't help the browsers rendering limitations of too many gradiens used -stored in the defs section.
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spectrum of colours free icon was designed by Lazur URH for icons Png and presented to its users.
Lazur URH
2/6/2018