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: -0.4586824883246252
    b: 1.8438804960822317
    c: 2.735168852259272
    d: 0.09921861617320538