diff --git a/run/control/CONTROL.documentation b/run/control/CONTROL.documentation
index 1c47f086b2c520ac5243c69125380d9018c7023a..f56313c993f87d6c13ad5f1d264ea1ace0a799cc 100644
--- a/run/control/CONTROL.documentation
+++ b/run/control/CONTROL.documentation
@@ -22,7 +22,7 @@ GATEWAY None
 
 #===============================================================================
 # GENERAL SECTION:
-# Specific storage, notifcication and data transfer settings.
+# Specific storage, notification and data transfer settings.
 # Selection of ECMWF access interface and extra output options. 
 #-------------------------------------------------------------------------------
 DEBUG 0
@@ -111,6 +111,7 @@ ETAPAR 77
 #-------------------------------------------------------------------------------
 CWC 0
 WRF 0
+DOUBLEELDA 0 
 ADDPAR None
 
 #===============================================================================
diff --git a/run/control/CONTROL_ZAMG_SYNTH_ELDA b/run/control/CONTROL_ZAMG_SYNTH_ELDA
index 15e9d7c8e43966de769672ac3fdc3fcc09fdd776..7b6ed9adc731585b71c3d6c573b489f25ad70e3d 100644
--- a/run/control/CONTROL_ZAMG_SYNTH_ELDA
+++ b/run/control/CONTROL_ZAMG_SYNTH_ELDA
@@ -1,22 +1,23 @@
-DTIME 3
-TYPE AN FC AN FC AN FC AN FC 
-TIME 00 18 06 06 12 06 18 18 
-STEP 00 09 00 03 00 09 00 03
-ACCTIME 06/18
-ACCMAXSTEP 12
-ACCTYPE FC
-CLASS OD
-STREAM ELDA 
-PREFIX EL
-UPPER 30.
-LOWER 10.
-LEFT -10.
-RIGHT 10.
-NUMBER 0/to/25
-GRID 1.
-RESOL 159
-ETA 1
-CWC 1
-LEVELIST 130/TO/137
-ADDPAR 186/187/188/235/139/39/134
-ECTRANS 1
+DTIME 3
+TYPE AN FC AN FC AN FC AN FC 
+TIME 00 18 06 06 12 06 18 18 
+STEP 00 09 00 03 00 09 00 03
+ACCTIME 06/18
+ACCMAXSTEP 12
+ACCTYPE FC
+CLASS OD
+STREAM ELDA 
+PREFIX EL
+UPPER 5.
+LOWER -5.
+LEFT -2.
+RIGHT 2.
+NUMBER 0/to/2
+GRID 1.
+RESOL 159
+ETA 1
+LEVELIST 135/TO/137
+ADDPAR 186/187/188/235/139/39/134
+ECTRANS 1
+RRINT 1
+DOUBLEELDA 0
diff --git a/source/python/classes/ControlFile.py b/source/python/classes/ControlFile.py
index 48026ad08a905dc1b3855a2e17d0b1d2f80d86da..1ff3ec98dd1769cffcdec1c005f2789930997178 100644
--- a/source/python/classes/ControlFile.py
+++ b/source/python/classes/ControlFile.py
@@ -329,15 +329,19 @@ class ControlFile(object):
         Switch to decide wether the job is a pure forecast retrieval or
         coupled with analysis data. Default value is 0.
 
-    rrint: int
+    rrint : int
         Switch to select between old precipitation disaggregation method (0)
         or the new IA3 disaggegration method (1). Default value is 0.
 
+    doubleelda : int
+        Switch to select the calculation of extra ensemble members for the
+        ELDA stream. It doubles the amount of retrieved ensemble members.
+
     logicals : list of str
         List of the names of logical switches which controls the flow
         of the program. Default list is ['gauss', 'omega', 'omegadiff', 'eta',
         'etadiff', 'dpdeta', 'cwc', 'wrf', 'grib2flexpart', 'ecstorage',
-        'ectrans', 'debug', 'request', 'public', 'purefc', 'rrint']
+        'ectrans', 'debug', 'request', 'public', 'purefc', 'rrint', 'doubleelda']
     '''
 
     def __init__(self, filename):
@@ -424,11 +428,12 @@ class ControlFile(object):
         self.cds_api = None
         self.purefc = 0
         self.rrint = 0
+        self.doubleelda = 0
 
         self.logicals = ['gauss', 'omega', 'omegadiff', 'eta', 'etadiff',
                          'dpdeta', 'cwc', 'wrf', 'grib2flexpart', 'ecstorage',
                          'ectrans', 'debug', 'oper', 'request', 'public',
-                         'purefc', 'rrint']
+                         'purefc', 'rrint', 'doubleelda']
 
         self._read_controlfile()
 
diff --git a/source/python/mods/prepare_flexpart.py b/source/python/mods/prepare_flexpart.py
index 0d6cfe8ce672124d1aa9256145bd2103cd6331f3..eae0189700d5146062298c4bfd150e2d9da7844b 100755
--- a/source/python/mods/prepare_flexpart.py
+++ b/source/python/mods/prepare_flexpart.py
@@ -70,11 +70,11 @@ import socket
 sys.path.append(os.path.dirname(os.path.abspath(
     inspect.getfile(inspect.currentframe()))) + '/../')
 import _config
-from .checks import check_ppid
+from mods.checks import check_ppid
 from classes.UioFiles import UioFiles
 from classes.ControlFile import ControlFile
-from .tools import (setup_controldata, clean_up, get_cmdline_args,
-                   read_ecenv, make_dir)
+from mods.tools import (setup_controldata, clean_up, get_cmdline_args,
+                        read_ecenv, make_dir, normal_exit)
 from classes.EcFlexpart import EcFlexpart
 
 # ------------------------------------------------------------------------------
@@ -162,7 +162,7 @@ def prepare_flexpart(ppid, c):
     # copy/transfer/interpolate them or make them GRIB2
     flexpart = EcFlexpart(c, fluxes=False)
     flexpart.create(inputfiles, c)
-    if c.stream.lower() == 'elda':
+    if c.stream.lower() == 'elda' and c.doubleelda:
         flexpart.calc_extra_elda(c.inputdir, c.prefix)
     flexpart.process_output(c)