Refactored

FastRng/Double/Distributions/BetaA2B2.cs

@@ -23,7 +23,7 @@ namespace FastRng.Double.Distributions
             set
             {
                 this.random = value;
-                this.fitter = new ShapeFitter(BetaA2B2.ShapeFunction, this.random, 50, 0.99);
+                this.fitter = new ShapeFitter(BetaA2B2.ShapeFunction, this.random, 100);
             }
         }
 

FastRng/Double/Distributions/Normal.cs

@@ -7,7 +7,7 @@ namespace FastRng.Double.Distributions
 {
     public sealed class Normal : IDistribution
     {
-        private const double SQRT_2PI = 2.506628275;
+        private const double SQRT_2_PI = 2.506628275;
         private const double STDDEV = 0.2;
         private const double MEAN = 0.5;
         
@@ -24,11 +24,11 @@ namespace FastRng.Double.Distributions
             set
             {
                 this.random = value;
-                this.fitter = new ShapeFitter(Normal.ShapeFunction, this.random, 50, 1.93);
+                this.fitter = new ShapeFitter(Normal.ShapeFunction, this.random, 100);
             }
         }
         
-        private static double ShapeFunction(double x) => 1.0 / (STDDEV * SQRT_2PI) * Math.Exp(-0.5 * Math.Pow((x - MEAN) / STDDEV, 2.0));
+        private static double ShapeFunction(double x) => 1.0 / (STDDEV * SQRT_2_PI) * Math.Exp(-0.5 * Math.Pow((x - MEAN) / STDDEV, 2.0));
 
         public async ValueTask<double> GetDistributedValue(CancellationToken token = default)
         {