sizes example for multi-column image layout

<img src="images/earth.t.jpg" alt=""
  	srcset="images/earth/earth-200.jpg 200w,
  	images/earth/earth-250.jpg 250w,
  	images/earth/earth-300.jpg 300w,
  	images/earth/earth-350.jpg 350w,
  	images/earth/earth-400.jpg 400w,
  	images/earth/earth-450.jpg 450w,
  	images/earth/earth-500.jpg 500w,
  	images/earth/earth-550.jpg 550w,
  	images/earth/earth-600.jpg 600w,
  	images/earth/earth-650.jpg 650w,
  	images/earth/earth-700.jpg 700w,
  	images/earth/earth-750.jpg 750w,
  	images/earth/earth-800.jpg 800w,
  	images/earth/earth-900.jpg 900w,
  	images/earth/earth-1000.jpg 1000w"
  	sizes="(max-width: 750px) 100vw,
  		   (max-width: 1090px) 50vw,
  		   (max-width: 1425px) 33vw,
  		   (min-width: 1426px) 25vw"
  	/>