fixed threshold at 1e-13

cpp_src/dsp/lasp_avpowerspectra.cpp

@@ -235,7 +235,8 @@ ccube AvSweepPowerSpectra::compute(const dmat &timedata)
         _n_averages = vd(nfreq, arma::fill::zeros);
       }
             
-      d threshold = arma::mean(arma::real(temp.slice(0).col(0)));
+      // d threshold = arma::mean(arma::real(temp.slice(0).col(0)));
+      d threshold = 1e-13;
       
       for (us f=0; f < nfreq; f++)
       {

cpp_src/dsp/lasp_siggen_impl.h

@@ -75,6 +75,8 @@ class Periodic: public Siggen {
 
     virtual vd genSignalUnscaled(const us nframes) override final;
 
+    vd getA() const { return A_; }
+
     ~Periodic() = default;
 
 };

cpp_src/pybind11/lasp_siggen.cpp

@@ -51,6 +51,10 @@ void init_siggen(py::module &m) {
   periodic.def("getSequence",
                [](const Sweep &s) { return ColToNpy<d>(s.getSequence()); });
 
+  periodic.def("getA", 
+               [](const Sweep &s) { return ColToNpy<d>(s.getA()); });  
+  
+
   py::class_<Sweep, std::shared_ptr<Sweep>> sweep(m, "Sweep", periodic);
   sweep.def(py::init<const d, const d, const d, const d, const us>());
   sweep.def("getfn",