var valuesDivs = [
	document.getElementById('range-value-1'),
	document.getElementById('range-value-2'),
	document.getElementById('range-value-3'),
	document.getElementById('range-value-4')
];

var diffDivs = [
	document.getElementById('range-diff-1'),
	document.getElementById('range-diff-2'),
	document.getElementById('range-diff-3')
];

// When the slider value changes, update the input and span
range.noUiSlider.on('update', function( values, handle ) {
	valuesDivs[handle].innerHTML = values[handle];
	diffDivs[0].innerHTML = values[1] - values[0];
	diffDivs[1].innerHTML = values[2] - values[1];
	diffDivs[2].innerHTML = values[3] - values[2];
});
