remove peaks intensity under static threshold of 1

src/pappsomspp/psm/xtandem/xtandemspectrumprocess.cpp

@@ -232,7 +232,7 @@ Spectrum XtandemSpectrumProcess::process (const Spectrum & spectrum, mz parent_i
     }
     //3) remove low masses
     //4) normalization
-    spectrum_process = spectrum_process.removeMzUnder(_minimum_mz).takeNmostIntense(_nmost_intense).applyDynamicRange(_dynamic_range).removeIntensityPercentUnder(0.01);
+    spectrum_process = spectrum_process.removeMzUnder(_minimum_mz).takeNmostIntense(_nmost_intense).applyDynamicRange(_dynamic_range).removeIntensityUnder(1);
     //5) remove neutral loss
     if (_exclude_parent_neutral_loss) {
         pappso_double parent_ion_mhplus= ((parent_ion_mz - (MHPLUS*parent_charge))*parent_charge)+MHPLUS ;