diff --git a/megaradrp/core/recipe.py b/megaradrp/core/recipe.py
index 013a6c3f..882c767a 100644
--- a/megaradrp/core/recipe.py
+++ b/megaradrp/core/recipe.py
@@ -46,14 +46,15 @@ def __init__(self, version):
                        'BadPixelsMaskRecipe': [OverscanCorrector, TrimImage,
                                                BiasCorrector, DarkCorrector],
                        'BiasRecipe': [OverscanCorrector, TrimImage,
-                                      BadPixelCorrector, DarkCorrector],
+                                      BadPixelCorrector],
                        'DarkRecipe': [OverscanCorrector, TrimImage,
                                       BiasCorrector],
                        'FiberFlatRecipe': [OverscanCorrector, TrimImage,
                                            BiasCorrector, BadPixelCorrector,
                                            DarkCorrector],
                        'TraceMapRecipe': [OverscanCorrector, TrimImage,
-                                          BiasCorrector, DarkCorrector],
+                                          BiasCorrector, BadPixelCorrector,
+                                          DarkCorrector],
 
                        }
         super(MegaraBaseRecipe, self).__init__(version=version)
@@ -72,17 +73,17 @@ def __generate_flow(self, params):
                         flow[cont] = (flow[cont](params['bpm']))
                     else:
                         del (flow[cont])
-                        cont -=1
+                        cont -= 1
                 elif issubclass(DarkCorrector, flow[cont]):
                     if 'dark' in params.keys():
                         flow[cont] = (flow[cont](params['dark']))
                     else:
                         del (flow[cont])
-                        cont -=1
+                        cont -= 1
                 elif issubclass(TrimImage, flow[cont]) or issubclass(
                         OverscanCorrector, flow[cont]):
                     flow[cont] = (flow[cont]())
-                cont +=1
+                cont += 1
             basicflow = SerialFlow(flow)
 
         except Exception as e:
@@ -134,4 +135,17 @@ def hdu_creation(self, obresult, params={}):
             for hdulist in cdata:
                 hdulist.close()
 
-        return fits.HDUList(lista), data
\ No newline at end of file
+        return fits.HDUList(lista), data
+
+    def get_parameters(self, rinput):
+
+        with rinput.master_bias.open() as hdul:
+            mbias = hdul[0].data.copy()
+
+        parameters = {'biasmap':mbias}
+        if rinput.master_bpm:
+            parameters['bpm'] = rinput.master_bpm
+        if rinput.master_dark:
+            parameters['dark'] = rinput.master_bpm
+
+        return parameters
diff --git a/megaradrp/recipes/calibration/arc.py b/megaradrp/recipes/calibration/arc.py
index fe39831d..6bb9a953 100644
--- a/megaradrp/recipes/calibration/arc.py
+++ b/megaradrp/recipes/calibration/arc.py
@@ -43,6 +43,7 @@
 from megaradrp.core.recipe import MegaraBaseRecipe
 from megaradrp.products import TraceMap
 from megaradrp.requirements import MasterBiasRequirement, MasterBPMRequirement
+from megaradrp.requirements import MasterDarkRequirement
 from megaradrp.core.processing import apextract_tracemap
 
 _logger = logging.getLogger('numina.recipes.megara')
@@ -54,6 +55,7 @@ class ArcCalibrationRecipe(MegaraBaseRecipe):
     # Requirements
     obresult = ObservationResultRequirement()
     master_bias = MasterBiasRequirement()
+    master_dark = MasterDarkRequirement()
     master_bpm = MasterBPMRequirement()
     tracemap = Requirement(TraceMap, 'Trace information of the Apertures')
     lines_catalog = Requirement(LinesCatalog, 'Catalog of lines')
@@ -68,11 +70,8 @@ def __init__(self):
 
     def run(self, rinput):
         # Basic processing
-        with rinput.master_bias.open() as hdul:
-            mbias = hdul[0].data.copy()
-
-        reduced = self.bias_process_common(rinput.obresult, {'biasmap':mbias,
-                                                             'bpm':None})
+        parameters = self.get_parameters(rinput)
+        reduced = self.bias_process_common(rinput.obresult, parameters)
 
         _logger.info('extract fibers')
         _logger.info('extract fibers, %i', len(rinput.tracemap))
diff --git a/megaradrp/recipes/calibration/flat.py b/megaradrp/recipes/calibration/flat.py
index a3a2c461..5113e62d 100644
--- a/megaradrp/recipes/calibration/flat.py
+++ b/megaradrp/recipes/calibration/flat.py
@@ -31,7 +31,8 @@
 from megaradrp.core.recipe import MegaraBaseRecipe
 from megaradrp.products import MasterFiberFlat
 from megaradrp.products import TraceMap
-from megaradrp.requirements import MasterBiasRequirement
+from megaradrp.requirements import MasterBiasRequirement, MasterBPMRequirement
+from megaradrp.requirements import MasterDarkRequirement
 from megaradrp.core.processing import apextract_tracemap
 
 _logger = logging.getLogger('numina.recipes.megara')
@@ -43,7 +44,8 @@ class FiberFlatRecipe(MegaraBaseRecipe):
     # Requirements
     obresult = ObservationResultRequirement()
     master_bias = MasterBiasRequirement()
-
+    master_dark = MasterDarkRequirement()
+    master_bpm = MasterBPMRequirement()
     tracemap = Requirement(TraceMap, 'Trace information of the Apertures')
     # Products
     fiberflat_frame = Product(MasterFiberFlat)
@@ -54,10 +56,9 @@ def __init__(self):
 
     def run(self, rinput):
         # Basic processing
-        with rinput.master_bias.open() as hdul:
-            mbias = hdul[0].data.copy()
+        parameters = self.get_parameters(rinput)
 
-        reduced = self.bias_process_common(rinput.obresult, {'biasmap':mbias})
+        reduced = self.bias_process_common(rinput.obresult, parameters)
 
         _logger.info('extract fibers')
         rssdata = apextract_tracemap(reduced[0].data, rinput.tracemap)
diff --git a/megaradrp/recipes/calibration/trace.py b/megaradrp/recipes/calibration/trace.py
index fb64b052..ff71aa33 100644
--- a/megaradrp/recipes/calibration/trace.py
+++ b/megaradrp/recipes/calibration/trace.py
@@ -33,6 +33,7 @@
 from megaradrp.products import MasterFiberFlat, TraceMap
 from megaradrp.core.recipe import MegaraBaseRecipe
 from megaradrp.requirements import MasterBiasRequirement, MasterBPMRequirement
+from megaradrp.requirements import MasterDarkRequirement
 from megaradrp.trace.traces import init_traces
 
 _logger = logging.getLogger('numina.recipes.megara')
@@ -41,8 +42,9 @@
 class TraceMapRecipe(MegaraBaseRecipe):
 
     obresult = ObservationResultRequirement()
-    master_bpm = MasterBPMRequirement()
     master_bias = MasterBiasRequirement()
+    master_dark = MasterDarkRequirement()
+    master_bpm = MasterBPMRequirement()
     fiberflat_frame = Product(MasterFiberFlat)
     traces = Product(TraceMap)
 
@@ -53,11 +55,8 @@ def __init__(self):
 
     def run(self, rinput):
 
-        # Basic processing
-        with rinput.master_bias.open() as hdul:
-            mbias = hdul[0].data.copy()
-
-        reduced = self.bias_process_common(rinput.obresult, {'biasmap':mbias})
+        parameters = self.get_parameters(rinput)
+        reduced = self.bias_process_common(rinput.obresult, parameters)
 
         data = reduced[0].data
         cstart = 2000
diff --git a/megaradrp/requirements.py b/megaradrp/requirements.py
index 299d899a..38df2c98 100644
--- a/megaradrp/requirements.py
+++ b/megaradrp/requirements.py
@@ -43,9 +43,10 @@ def __init__(self, optional=True):
 
 
 class MasterDarkRequirement(Requirement):
-    def __init__(self):
+    def __init__(self, optional=True):
         super(MasterDarkRequirement,
-              self).__init__(MasterDark, 'Master DARK image')
+              self).__init__(MasterDark, 'Master DARK image',
+                             optional=optional)
 
 
 class MasterFiberFlatRequirement(Requirement):