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: 0.8120627026784604
    b: -1.0938878101582916
    c: -2.781091448557863
    d: 2.5780432456852056