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- A radial gradient from a spot swatch to a CMYK color is written as a DeviceN shading (ShadingType 3) of Yellow and the spot ink. - A Lab spot color used as a flat fill and in a mixed gradient is written as one Separation space with the Lab alternate, which the DeviceN space names under /Colorants. - docs/roadmap.md lists the gradients that still export without the spot ink: mixed spot/process gradients in SVG and PDF gradients with RGB or Lab stops. docs/target-app-parity.md also notes that a Perceptual gradient is written to PDF as an image.