diff --git a/lisainstrument/instrument.py b/lisainstrument/instrument.py
index 745d37ef7c7a92633cf8c1009718b0caa74ad95b..6e35b411f710646660b0460fccb211bc95257968 100755
--- a/lisainstrument/instrument.py
+++ b/lisainstrument/instrument.py
@@ -974,7 +974,7 @@ class Instrument:
         ## TDIR modulations
 
         logger.debug("Forming TDIR assistance modulations")
-        self.tdir_modulations = ForEachMOSA(lambda mosa:
+        self.tdir_modulations_tseries = ForEachMOSA(lambda mosa:
             self.tdir_modulations[mosa](self.physics_et + self.the_wrt_tps_local[mosa[0]])
         )
 
@@ -1722,7 +1722,7 @@ class Instrument:
 
         logger.debug("Computing carrier fluctuations for primary local beam %s", mosa)
         self.local_carrier_fluctuations[mosa] = \
-            self.laser_noises[mosa] + self.glitch_lasers[mosa] + self.tdir_modulations[mosa]
+            self.laser_noises[mosa] + self.glitch_lasers[mosa] + self.tdir_modulations_tseries[mosa]
 
 
     def lock_on_adjacent(self, mosa):
@@ -1747,7 +1747,7 @@ class Instrument:
         self.local_carrier_fluctuations[mosa] = adjacent_carrier_fluctuations \
             - self.fplan[mosa] * self.clock_noise_fluctuations[sc(mosa)] \
             + self.central_freq * self.oms_rfi_carrier_noises[mosa] \
-            + self.tdir_modulations[mosa]
+            + self.tdir_modulations_tseries[mosa]
 
 
     def lock_on_distant(self, mosa):
@@ -1781,7 +1781,7 @@ class Instrument:
         self.local_carrier_fluctuations[mosa] = distant_carrier_fluctuations \
             - self.fplan[mosa] * self.clock_noise_fluctuations[sc(mosa)] \
             + self.central_freq * self.oms_isi_carrier_noises[mosa] \
-            + self.tdir_modulations[mosa]
+            + self.tdir_modulations_tseries[mosa]
 
 
     def simulate_locking(self):
@@ -1972,7 +1972,7 @@ class Instrument:
                 self.glitch_lasers.write(hdf5, 'glitch_lasers')
 
                 logger.debug("Writing TDIR assistance modulations to %s", output)
-                self.tdir_modulations.write(hdf5, 'tdir_modulations')
+                self.tdir_modulations_tseries.write(hdf5, 'tdir_modulations_tseries')
 
                 logger.debug("Writing laser noise to '%s'", output)
                 self.laser_noises.write(hdf5, 'laser_noises')