diff --git a/dsp/framed_model.cpp b/dsp/framed_model.cpp
index 397651a..cc6d30b 100644
--- a/dsp/framed_model.cpp
+++ b/dsp/framed_model.cpp
@@ -139,7 +139,7 @@ void FramedDetector::processFrame(const std::complex<double>* spectrum, float* m
             double res_k = std::max(static_cast<double>(res_[b][k]), 1e-12);
             double lvl = static_cast<double>(am_[k]) / res_k;
             double xv = std::log10(std::max(lvl, 1e-9));
-            double C = G_FIT * lut_parametric(xv, CAP_A_LEVEL, CAP_B_LEVEL, CAP_GAMMA) + W_FIT * std::pow(warp_c(fk), A_FIT);
+            double C = G_FIT * lut_pchip(xv) + W_FIT * std::pow(warp_c(fk), A_FIT);
             double g = std::max(1.0 - C, 1e-9) * std::pow(res_k, rp);
             mask[k] = std::min(static_cast<float>(g), mask[k]);
             fk += fstep;