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: -2.9842024037144537
    b: 0.2909202801737161
    c: 0.4548486144270978
    d: 1.4911526485740243