diff --git a/QtPyLoT.py b/QtPyLoT.py
index a8ccdfb5..2cf0e6bb 100755
--- a/QtPyLoT.py
+++ b/QtPyLoT.py
@@ -64,7 +64,7 @@ from pylot.core.io.data import Data
 from pylot.core.io.inputs import FilterOptions, PylotParameter
 from autoPyLoT import autoPyLoT
 from pylot.core.pick.compare import Comparison
-from pylot.core.pick.utils import symmetrize_error
+from pylot.core.pick.utils import symmetrize_error, getQualityfromUncertainty
 from pylot.core.io.phases import picksdict_from_picks
 import pylot.core.loc.nll as nll
 from pylot.core.util.defaults import FILTERDEFAULTS, SetChannelComponents
@@ -1951,13 +1951,19 @@ class MainWindow(QMainWindow):
             }
 
         stat_picks = self.getPicks(type=picktype)[station]
-
         stime = self.getStime()
 
         for phase in stat_picks:
             picks = stat_picks[phase]
             if type(stat_picks[phase]) is not dict and type(stat_picks[phase]) is not AttribDict:
                 return
+
+            # get quality classes
+            if phase[0] == 'P':
+                quality = getQualityfromUncertainty(picks['spe'], self._inputs['timeerrorsP'])
+            elif phase[0] == 'S':
+                quality = getQualityfromUncertainty(picks['spe'], self._inputs['timeerrorsS'])
+
             colors = phase_col[phase[0].upper()]
 
             mpp = picks['mpp'] - stime
@@ -1994,7 +2000,8 @@ class MainWindow(QMainWindow):
                     else:
                         pw.plot([mpp, mpp], ylims, pen=colors[0], name='{}-Pick (NO PICKERROR)'.format(phase))
                 elif picktype == 'auto':
-                    pw.plot([mpp, mpp], ylims, pen=colors[3])
+                    if quality < 4:
+                        pw.plot([mpp, mpp], ylims, pen=colors[3])
                 else:
                     raise TypeError('Unknown picktype {0}'.format(picktype))
             else:
@@ -2009,9 +2016,10 @@ class MainWindow(QMainWindow):
                     else:
                         ax.plot([mpp, mpp], ylims, colors[6], label='{}-Pick (NO PICKERROR)'.format(phase))
                 elif picktype == 'auto':
-                    ax.plot(mpp, ylims[1], colors[3],
-                            mpp, ylims[0], colors[4])
-                    ax.vlines(mpp, ylims[0], ylims[1], colors[5], linestyles='dotted')
+                    if quality < 4:
+                        ax.plot(mpp, ylims[1], colors[3],
+                                mpp, ylims[0], colors[4])
+                        ax.vlines(mpp, ylims[0], ylims[1], colors[5], linestyles='dotted')
                 else:
                     raise TypeError('Unknown picktype {0}'.format(picktype))
 
diff --git a/pylot/core/pick/utils.py b/pylot/core/pick/utils.py
index 41a5509a..5f1a8d43 100644
--- a/pylot/core/pick/utils.py
+++ b/pylot/core/pick/utils.py
@@ -1069,6 +1069,31 @@ def checkZ4S(X, pick, zfac, checkwin, iplot, fig=None):
         ax.set_xlabel('Time [s] since %s' % zdat[0].stats.starttime)
     return returnflag
 
+def getQualityfromUncertainty(uncertainty, Errors):
+    '''Script to transform uncertainty into quality classes 0-4
+       regarding adjusted time errors Errors.
+    '''
+
+    if uncertainty == None or uncertainty == 'None':
+       quality = 4
+    else:
+        if uncertainty <= Errors[0]:
+            quality = 0
+        elif (uncertainty > Errors[0]) and \
+             (uncertainty < Errors[1]):
+            quality = 1
+        elif (uncertainty > Errors[1]) and \
+             (uncertainty < Errors[2]):
+            quality = 2
+        elif (uncertainty > Errors[2]) and \
+             (uncertainty < Errors[3]):
+            quality = 3
+        elif uncertainty > Errors[3]:
+            quality = 4
+        else:
+            pass
+
+    return quality
 
 if __name__ == '__main__':
     import doctest