Gradients allow a gradual change in buffer strength, and are convenient, as gradient mixers or pumps can be automated. Gradients are often used for eluting buffers.

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Both sentences accurately describe the use and benefits of gradients in chromatography, including their role in facilitating a gradual change in buffer strength and their convenience due to automation capabilities. Gradients are indeed commonly used for eluting buffers in various chromatographic techniques.

Gradients Allow a Gradual Change in Buffer Strength, and Are