public static IEnumerable <double> TemporalPointSourceCenterlinePHD(
            this IForwardSolver myForwardSolver,
            IEnumerable <OpticalProperties> ops, IEnumerable <double> rProbes,
            IEnumerable <double> rhos, IEnumerable <double> zs, IEnumerable <double> ts)
        {
            foreach (var op in ops)
            {
                DiffusionParameters dp = DiffusionParameters.Create(op, ForwardModel.SDA);
                foreach (var rProbe in rProbes)
                {
                    foreach (var rho in rhos)
                    {
                        foreach (var z in zs)
                        {
                            var r11 = CalculatorToolbox.GetRadius(rProbe, z - dp.zp);
                            var r12 = CalculatorToolbox.GetRadius(rProbe, z + dp.zp + 2 * dp.zb);
                            var r21 = CalculatorToolbox.GetRadius(rho - rProbe, z);
                            var r22 = CalculatorToolbox.GetRadius(rho - rProbe, z + 2 * dp.zb);

                            foreach (var t in ts)
                            {
                                Func <double, double> integrandConvolve =
                                    tau =>
                                {
                                    return
                                        (DiffusionGreensFunctions.TemporalPointSourceImageGreensFunction
                                             (dp, r11, r12, tau) *
                                         DiffusionGreensFunctions.TemporalPointSourceImageGreensFunction
                                             (dp, r21, r22, t - tau));
                                };
                                yield return(FunctionMath.Integrate(
                                                 integrandConvolve, Meta.Numerics.Interval.FromEndpoints(0.0, t)));
                            }
                        }
                    }
                }
            }
        }