click:     refresh

    a:         move mouse left/right 
    b: shift + move mouse left/right 
    c: ctrl  + move mouse left/right 
    d: alt   + move mouse left/right 

    color = rgba(a, b, c, d) with mapped domain
  

  
    a: 0.21105927053017037
    b: -1.229427337322494
    c: 0.7390531861437504
    d: -1.7145471694406043