title: How do I calculate the distance between the marks on the picture above as pixels on wolfram mathematica?
body: <p><a href="https://i.stack.imgur.com/8e7rG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8e7rG.png" alt="enter image description here"></a></p>
  
  <p>How do I calculate the distance between the marks on the picture above as pixels on wolfram mathematica?</p>