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: 2.6010961879630123
    b: -2.207252560741382
    c: -2.0203906032179395
    d: -0.8820237162034998