label only lower ax for shared frequency axes

src/python_spectrometer/_plot_manager.py

@@ -67,7 +67,7 @@ class PlotManager:
 
         if not any('layout' in key for key in self.figure_kw.keys()):
             self.figure_kw['layout'] = 'tight'
-        if self.subplot_kw.pop('sharex', None) is not None:
+        if self.subplot_kw.pop('sharex', None) is False:
             warnings.warn('sharex in subplot_kw not negotiable, dropping', UserWarning)
 
         self.setup_figure()
@@ -387,16 +387,18 @@ class PlotManager:
         if self.axes['main']['processed'] is None:
             self.axes['main']['processed'] = self.fig.add_subplot(gs[:2], **self.subplot_kw)
             self.axes['main']['processed'].grid(True)
-            self.axes['main']['processed'].set_xlabel('$f$ (Hz)')
         self.axes['main']['processed'].set_xscale('log')
         self.axes['main']['processed'].set_yscale('linear' if self.plot_dB_scale else 'log')
         # can change
+        self.axes['main']['processed'].set_xlabel('$f$ (Hz)' if not self.plot_cumulative else '')
         self.axes['main']['processed'].set_ylabel(
             _ax_label(self.plot_amplitude, False, self.plot_dB_scale, self.reference_spectrum)
             + _ax_unit(self.plot_amplitude, self.plot_density, False,
                        self.plot_cumulative_normalized, self.plot_dB_scale,
                        'dB' if self.plot_dB_scale else self.processed_unit)
         )
+        self.axes['main']['processed'].xaxis.set_tick_params(which="both",
+                                                             labelbottom=not self.plot_cumulative)
         if self.plot_raw:
             if self.axes['main']['raw'] is None:
                 self.axes['main']['raw'] = self.axes['main']['processed'].twinx()