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In an embodiment, the cooled second part of the recycle gas is completely or substantially liquefied in step (h). In another embodiment, the second part of the recycle gas is liquefied to form liquefied methane and a second vapor stream in step (h), and the second vapor stream is reheated and compress in a step (i) to a second vapor stream pressure of from 40 bar to 120 bar to form a second constituent of the recycle gas.