code: public int[] getTenors() {
  		Set<Integer> setTenors	= new HashSet<>();
  
  		for(int moneyness : getGridNodesPerMoneyness().keySet()) {
  			setTenors.addAll(Arrays.asList((IntStream.of(keyMap.get(moneyness)[1]).boxed().toArray(Integer[]::new))));
  		}
  		return setTenors.stream().sorted().mapToInt(Integer::intValue).toArray();
  	}
docs: Return all tenors for which data exists.
  
  @return The tenors in months.