diff --git a/ostap/math/make_fun.py b/ostap/math/make_fun.py
index c5ac77b1..013a1751 100644
--- a/ostap/math/make_fun.py
+++ b/ostap/math/make_fun.py
@@ -13,9 +13,9 @@
 __author__  = "Vanya BELYAEV Ivan.Belyaev@cern.ch"
 __date__    = "2023-02-14"
 __all__     = (
-    'make_fun1'  , ## conbert 1D python function/callable into C++ function
-    'make_fun2'  , ## conbert 2D python function/callable into C++ function
-    'make_fun3'  , ## conbert 3D python function/callable into C++ function    
+    'make_fun1'  , ## convert 1D python function/callable into C++ function
+    'make_fun2'  , ## convert 2D python function/callable into C++ function
+    'make_fun3'  , ## convert 3D python function/callable into C++ function    
     )
 # =============================================================================
 from ostap.core.meta_info import root_info 
@@ -30,7 +30,7 @@
 if ( 6 , 24 ) <= root_info :
     ## convert python 1D-function into C++ functor 
     def make_fun1 ( fun , forcepc = False ) :
-        """Convert python 1D-function into C++ functor"""
+        """ Convert python 1D-function into C++ functor"""
         assert callable ( fun ) , 'Function must be callable!'
         ##
         if forcepc :
@@ -40,7 +40,7 @@ def make_fun1 ( fun , forcepc = False ) :
         return Ostap.Math.Apply  ( fun )
     ## convert python 2D-function into C++ functor 
     def make_fun2 ( fun , forcepc = False ) :
-        """Convert python 2D-function into C++ functor"""
+        """ Convert python 2D-function into C++ functor"""
         assert callable ( fun ) , 'Function must be callable!'
         ##
         if forcepc :
@@ -50,7 +50,7 @@ def make_fun2 ( fun , forcepc = False ) :
         return Ostap.Math.Apply2 ( fun )
     ## convert python 3D-function into C++ functor 
     def make_fun3 ( fun , forcepc = False ) :
-        """Convert python 3D-function into C++ functor"""
+        """ Convert python 3D-function into C++ functor"""
         assert callable ( fun ) , 'Function must be callable!'
         ##
         if forcepc :
@@ -62,7 +62,7 @@ def make_fun3 ( fun , forcepc = False ) :
 elif (6,18) <= root_info :
     # =========================================================================
     def make_fun1 ( fun , forcepc = False ) :
-        """Convert python 1D-function into C++ functor"""
+        """ Convert python 1D-function into C++ functor"""
         assert callable ( fun ) , 'Function must be callable!'        
         PC  = Ostap.Functions.PyCallable
         pc  = fun if isinstance ( fun , PC ) else PC ( fun , True )
@@ -73,7 +73,7 @@ def make_fun1 ( fun , forcepc = False ) :
         res ._pc = pc,fun 
         return res 
     def make_fun2 ( fun  , forcepc = False ) :
-        """Convert python 2D-function into C++ functor"""
+        """ Convert python 2D-function into C++ functor"""
         assert callable ( fun ) , 'Function must be callable!'
         PC2 = Ostap.Functions.PyCallable2
         pc  = fun if isinstance ( fun , PC2 ) else PC2 ( fun , True )
@@ -84,7 +84,7 @@ def make_fun2 ( fun  , forcepc = False ) :
         res ._pc = pc,fun 
         return res 
     def make_fun3 ( fun  , forcepc = False ) :
-        """Convert python 3D-function into C++ functor"""
+        """ Convert python 3D-function into C++ functor"""
         assert callable ( fun ) , 'Function must be callable!'
         PC3 = Ostap.Functions.PyCallable3
         pc  = fun if isinstance ( fun , PC3 ) else PC3 ( fun , True )
@@ -98,17 +98,17 @@ def make_fun3 ( fun  , forcepc = False ) :
 else :
     # =========================================================================
     def make_fun1 ( fun , forcepc = False ) :
-        """Convert python 1D-function into C++ functor"""
+        """ Convert python 1D-function into C++ functor"""
         assert callable ( fun ) , 'Function must be callable!'
         PC = Ostap.Functions.PyCallable
         return fun if isinstance ( fun , PC ) else PC ( fun , True ) 
     def make_fun2 ( fun , forcepc = False ) :
-        """Convert python 2D-function into C++ functor"""
+        """ Convert python 2D-function into C++ functor"""
         assert callable ( fun ) , 'Function must be callable!'
         PC2 = Ostap.Functions.PyCallable2
         return fun if isinstance ( fun , PC2 ) else PC2 ( fun , True ) 
     def make_fun3 ( fun , forcepc = False ) :
-        """Convert python 3D-function into C++ functor"""
+        """ Convert python 3D-function into C++ functor"""
         assert callable ( fun ) , 'Function must be callable!'
         PC3 = Ostap.Functions.PyCallable3
         return fun if isinstance ( fun , PC3 ) else PC3 ( fun , True ) 
diff --git a/source/include/Ostap/Integrator.h b/source/include/Ostap/Integrator.h
index 61eb742d..de183438 100644
--- a/source/include/Ostap/Integrator.h
+++ b/source/include/Ostap/Integrator.h
@@ -92,9 +92,9 @@ namespace Ostap
       // ======================================================================
       /// constructor with integration workspace size
       Integrator
-      ( const std::size_t    size         = 0  , 
-        const unsigned short size_cquad   = 0  ,
-        const unsigned short size_romberg = 0  ) ;
+      ( const std::size_t    size         = 0 , 
+        const unsigned short size_cquad   = 0 ,
+        const unsigned short size_romberg = 0 ) ;
       // ======================================================================
       /// constructor with integration workspace
       Integrator
@@ -108,7 +108,7 @@ namespace Ostap
       /** calculate the integral 
        *  \f[ r = \int_{x_{min}}^{x_{max}} f_1(x) dx \f]
        *  @param f1 the function 
-       *  @param xmin lower integration edge 
+       *  @param xmin lower  integration edge 
        *  @param xmax upper  integration edge
        *  @param tag  uqniue label/tag  
        *  @param rescale rescale function for better numerical precision  
@@ -174,7 +174,7 @@ namespace Ostap
        *  @param f1 the function 
        *  @param xmax upper  integration edge
        *  @param integration workspace 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @return the value of the integral 
        */
       template <class FUNCTION1>
@@ -196,7 +196,7 @@ namespace Ostap
        *  @param c       the parameter 
        *  @param xmin    lower integration edge 
        *  @param xmax    upper integration edge 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical treatmenrt 
        *  @return the value of the integral 
        */
@@ -221,7 +221,7 @@ namespace Ostap
        *  @param f1 the function 
        *  @param c  the parameter 
        *  @param xmin lower integration edge 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical treatmenrt 
        *  @return the value of the integral 
        */
@@ -247,7 +247,7 @@ namespace Ostap
        *  @param f1 the function 
        *  @param c  the parameter 
        *  @param xmax upper integration edge 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical treatmenrt 
        *  @return the value of the integral 
        */
@@ -278,7 +278,7 @@ namespace Ostap
        *  @param f1      the function 
        *  @param c       the parameter 
        *  @param ws      integration workspace 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical precision  
        *  @param aprecision absolute precision  (if non-positive s_APRECISION_GAWC is used) 
        *  @param aprecision relative precision  (if non-positive s_RPRECISION_GAWC is used) 
@@ -314,7 +314,7 @@ namespace Ostap
        *  @param xmin low integration edge 
        *  @param n   number of subtractions 
        *  @see Ostap::Math::Integrtator::cauchy_pv_to_infinity 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical treatmenrt 
        *  @return the value of the integral 
        */
@@ -856,7 +856,7 @@ namespace Ostap
        *  @param xmin    lower integration edge 
        *  @param xmax    upper  integration edge 
        *  @param ws      integration workspace 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical precision  
        */
       template <class FUNCTION1>
@@ -882,7 +882,7 @@ namespace Ostap
        *  @param c  the parameter 
        *  @param xmin lower integration edge 
        *  @param ws      integration workspace 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical precision  
        */
       template <class FUNCTION1>
@@ -908,7 +908,7 @@ namespace Ostap
        *  @param c  the parameter 
        *  @param xmax upper integration edge 
        *  @param integration workspace 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical precision  
        */
       template <class FUNCTION1>
@@ -951,7 +951,7 @@ namespace Ostap
        *  @param f1      the function 
        *  @param c       the parameter 
        *  @param ws      integration workspace 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical precision  
        *  @param aprecision absolute precision  (if non-positive s_APRECISION_QAWC is used) 
        *  @param aprecision relative precision  (if non-positive s_RPRECISION_QAWC is used) 
@@ -981,7 +981,7 @@ namespace Ostap
        *  @param s  s-parameter 
        *  @param xmin  lower integration range 
        *  @param n     number of subtracion
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical precision  
        *  @return value of the dispersion integral 
        *  @see Ostap::Math::Integrator::cauchy_pv_to_infinity 
@@ -1179,7 +1179,7 @@ namespace Ostap
        *  @param xmin    lower integration edge 
        *  @param xmax    upper  integration edge 
        *  @param ws      integration workspace 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical precision  
        *  @param aprecision absolute precision  (if non-positive s_APRECISION_QAWC is used) 
        *  @param aprecision relative precision  (if non-positive s_RPRECISION_QAWC is used) 
@@ -1207,7 +1207,7 @@ namespace Ostap
        *  @param c  the parameter 
        *  @param xmin lower integration edge 
        *  @param ws      integration workspace 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical precision  
        *  @param aprecision absolute precision
        *  @param aprecision relative precision
@@ -1231,7 +1231,7 @@ namespace Ostap
        *  @param c  the parameter 
        *  @param xmax upper integration edge 
        *  @param integration workspace 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical precision  
        *  @param aprecision absolute precision 
        *  @param aprecision relative precision 
@@ -1272,7 +1272,7 @@ namespace Ostap
        *  @param f1      the function 
        *  @param c       the parameter 
        *  @param ws      integration workspace 
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical precision  
        *  @param aprecision absolute precision  (if non-positive s_APRECISION_QAWC is used) 
        *  @param aprecision relative precision  (if non-positive s_RPRECISION_QAWC is used) 
@@ -1297,7 +1297,7 @@ namespace Ostap
        *  @param s  s-parameter 
        *  @param xmin  lower integration range 
        *  @param n     number of subtracion
-       *  @param tag     unuque label/tag 
+       *  @param tag     unique label/tag 
        *  @param rescale rescale function for better numerical precision  
        *  @param aprecision absolute precision 
        *  @param aprecision relative precision