diff --git a/src/LimitedDomainCdf.re b/src/LimitedDomainCdf.re
new file mode 100644
index 00000000..7a33db45
--- /dev/null
+++ b/src/LimitedDomainCdf.re
@@ -0,0 +1,33 @@
+type t = {
+  distribution: Types.distribution,
+  domainMaxX: float,
+};
+
+let fromCdf = (cdf: Types.cdf, domainMaxX: float, probabilityAtMaxX: float) => {
+  let distribution: Types.distribution = {
+    xs: cdf.xs,
+    ys: cdf.ys |> E.A.fmap(r => r *. probabilityAtMaxX),
+  };
+  {distribution, domainMaxX};
+};
+
+let _lastElement = (a: array('a)) =>
+  switch (Belt.Array.size(a)) {
+  | 0 => None
+  | n => Belt.Array.get(a, n)
+  };
+
+let probabilityBeforeDomainMax = (t: t) => _lastElement(t.distribution.ys);
+
+let chanceByX = (t: t) => t.distribution;
+
+let domainMaxX = (t: t) => t.domainMaxX;
+
+let probabilityDistribution = (t: t) =>
+  t.distribution |> CdfLibrary.Distribution.toPdf;
+
+let probability = (t: t, xPoint: float) =>
+  CdfLibrary.Distribution.findY(xPoint, probabilityDistribution(t));
+
+let cumulativeProbability = (t: t, xPoint: float) =>
+  CdfLibrary.Distribution.findY(xPoint, t.distribution);
\ No newline at end of file
diff --git a/src/lib/Prop.re b/src/lib/Prop.re
index 57a77e54..bc238c6b 100644
--- a/src/lib/Prop.re
+++ b/src/lib/Prop.re
@@ -38,7 +38,7 @@ module Value = {
     | SelectSingle(r) => r |> ReasonReact.string
     | FloatCdf(r) =>
       let cdf: Types.distribution =
-        CdfLibrary.Distribution.fromString(r, 1000);
+        CdfLibrary.Distribution.fromString(r, 2000);
       <>
         <ForetoldComponents.CdfChart__Large
           cdf={Types.toComponentsDist(cdf)}
diff --git a/src/lib/Types.re b/src/lib/Types.re
index cd30637a..ea323b11 100644
--- a/src/lib/Types.re
+++ b/src/lib/Types.re
@@ -6,4 +6,12 @@ type distribution = {
 let toComponentsDist = (d: distribution): ForetoldComponents.Types.Dist.t => {
   xs: d.xs,
   ys: d.ys,
-};
\ No newline at end of file
+};
+
+type pdf = distribution;
+type cdf = distribution;
+
+let foo = (b: pdf) => 3.9;
+let bar: cdf = {xs: [||], ys: [||]};
+
+let cc = foo(bar);
\ No newline at end of file