new: convenience plottable_dBc

src/scgenerator/noise.py

@@ -118,6 +118,10 @@ class NoiseMeasurement:
     def psd_dBc(self) -> np.ndarray:
         return np.log10(self.psd) * 10
 
+    @property
+    def plottable_dBc(self) -> tuple[np.ndarray, np.ndarray]:
+        return self.freq[1:], self.psd_dBc[1:]
+
     def sample_spectrum(self, nt: int, dt: float | None = None) -> tuple[np.ndarray, np.ndarray]:
         """
         sample an amplitude spectrum with nt points. The corresponding sample spacing in the time