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: -0.7837563746820435
    b: -1.5598270388645927
    c: -1.8939231048541618
    d: 0.7570505448570826