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: -1.6046210532552816
    b: -2.2580123859866705
    c: -1.5965233550399882
    d: 1.1856912491485287