A methane-rich gas from synthesis gas is made in a methane reactor with a row of methanation stages and, at an upstream end of the row of methanation stages, a CO conversion stage. The laser system produces a second laser beam for accurately cleaning up the ragged hole so that the final hole has dimensions of high precision. A holding member may be associated with one bore, the member configured to engage a bone fastener such as a bone screw or pedicle hook. A plurality of light sensing devices are arranged in the light sensing area for converting incident light into electrical signals. The decision on where to place third color dots is thus made after, and therefore dependent on, the decisions on where to place first color dots and second color dots. A vane of a second cylinder is compressed and urged corresponding to a differential pressure between an intra-casing pressure guided into a vane chamber and a suction pressure or discharge pressure guided to the cylinder chamber.