Mariquita is the last of four 19-meter yachts built before World War I, while Tuiga was built to the more popular 15-meter standard.

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The industry watchdog said no major supplier had equalised prepayment meter charges with standard credit for both gas and electricity.

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And from this year, new facilities are to meet the tougher international standard of 0.1 nanograms per cubic meter.

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As you might expect, however, that's not quite as simple as a firmware upgrade, and currently requires a 34-node network to keep watch on a standard living room, which is apparently enough to pin down moving objects within a meter or so.

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