Spaced-Repetition Forgetting Curve

{
  "data": [
    { "type":"scatter","mode":"lines","name":"No review",
      "x":[0,1,2,3,5,7,10,14,21,30],
      "y":[100,60,40,30,22,18,14,12,9,7],
      "line":{"color":"#94a3b8","width":2,"dash":"dash"} },
    { "type":"scatter","mode":"lines","name":"With spaced reviews",
      "x":[0,1,2,3,3.01,5,7,7.01,10,14,21,21.01,30],
      "y":[100,60,40,30,100,70,55,100,80,70,55,100,90],
      "line":{"color":"#3666ff","width":3} }
  ],
  "layout":{
    "title":"Forgetting curve — with vs without spaced review",
    "xaxis":{"title":"Days"},
    "yaxis":{"title":"Retention (%)","range":[0,105]}
  }
}