India sold airwaves worth $1.3 billion in an auction — a fraction of what it earned in the past — as the country’s three remaining private sector operators rein in capital spending in a whittled-down sector.The spectrum auction, concluded on Wednesday, received more than 113.4 billion rupees ($1.3 billion) in bids and sold 141 mega hertz of spectrum, the government said in a statement. Airwaves in eight bands were put on the block by the Narendra Modi administration....