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: -0.6627959243120976
    b: -0.5341306089890576
    c: -1.7705170127884664
    d: -0.30038446226677795