diff --git a/lib/raweat.hpp b/lib/raweat.hpp
index 28df285..684b036 100644
--- a/lib/raweat.hpp
+++ b/lib/raweat.hpp
@@ -214,12 +214,11 @@ public:
       totalmarksize += datasec_[mrk.first].size();
     }
     // std::cout<<"totalmarksize "<<totalmarksize<<"\n";
+    // std::cout<<"\n";
 
     // check validity of format
     // assert ( totalmarksize > 0 && "didn't find any predefined marker => probably not a valid .raw-file" );
     if ( totalmarksize < 100 ) valid_ = false;
-
-    std::cout<<"\n";
   }
 
   // get all predefined markers
@@ -573,38 +572,29 @@ public:
     return segments_[marker];
   }
 
-  // write data to csv-like file
-  void write_data(std::string filename, int precision = 9, int width = 25)
+  // write csv file
+  void write_table(std::string filename, char delimiter = ',', int precision = 6, int width = 25)
   {
-    // assert ( segments_.size() > 0 );
-    // assert ( datmes_.size() > 0 );
-
     if ( valid_ )
     {
       // open file
       std::ofstream fout(filename.c_str());
 
-      // write header
-  //    fout<<"# ";
+      // define column names (including units)
       std::string colA = std::string("Time [") + get_temp_unit() + std::string("]");
       std::string colB = get_name() + std::string(" [") + get_unit() + std::string("]");
-      if ( width > 0 )
+
+      // write header
+      if ( delimiter != ' ' )
       {
-  //      fout<<std::setw(width)<<std::left<<colA;
-  //      fout<<std::setw(width)<<std::left<<colB;
-          fout<<std::setw(width)<<std::right<<"Time";
-          fout<<std::setw(width)<<std::right<<get_name();
-          fout<<"\n";
-          fout<<std::setw(width)<<std::right<<get_temp_unit();
-          fout<<std::setw(width)<<std::right<<get_unit();
+        fout<<colA<<delimiter<<colB<<"\n";
       }
       else
       {
-  //      fout<<colA<<","<<colB;
-        fout<<"Time"<<","<<get_name()<<"\n";
-        fout<<get_temp_unit()<<";"<<get_unit();
+        fout<<std::setw(width)<<std::right<<colA;
+        fout<<std::setw(width)<<std::right<<colB;
+        fout<<"\n";
       }
-      fout<<"\n";
 
       // get time step and offset
       double dt = get_dt();
@@ -617,16 +607,19 @@ public:
         // get time
         double tim = tidx*dt + timoff;
 
-        if ( width > 0 )
+        if ( delimiter != ' ' )
         {
-          fout<<std::fixed<<std::dec<<std::setprecision(precision)<<std::setw(width)<<std::right<<tim;
-          fout<<std::fixed<<std::dec<<std::setprecision(precision)<<std::setw(width)<<std::right<<el;
+          fout<<std::fixed<<std::dec<<std::setprecision(precision)
+              <<tim<<delimiter<<el<<"\n";
         }
         else
         {
-          fout<<std::fixed<<std::dec<<std::setprecision(precision)<<tim<<","<<el;
+          fout<<std::fixed<<std::dec<<std::setprecision(precision)
+              <<std::setw(width)<<std::right<<tim;
+          fout<<std::fixed<<std::dec<<std::setprecision(precision)
+              <<std::setw(width)<<std::right<<el;
+          fout<<"\n";
         }
-        fout<<"\n";
 
         // keep track of timestep
         tidx++;
diff --git a/makefile b/makefile
index 13640b4..d66f868 100644
--- a/makefile
+++ b/makefile
@@ -25,6 +25,7 @@ eatall : $(SRC)eatall.cpp $(LIB)raweat.hpp
 clean :
 	rm -f $(EXE)
 	rm -f eatall
+	rm -f eatdev
 
 # check existence of name of executable globally
 chexe:=$(shell command -v $(EXE))
diff --git a/pyt/example.py b/pyt/example.py
index 4ac97a4..c3b7e4e 100644
--- a/pyt/example.py
+++ b/pyt/example.py
@@ -12,4 +12,4 @@ print(eatraw.unit())
 print(eatraw.get_time())
 print(eatraw.get_channel())
 
-eatraw.print(b"mycsv.csv")
+eatraw.write_table(b"mycsv.csv",ord(' '))
diff --git a/raw_eater.pxd b/raw_eater.pxd
index 2ab2db9..46f7e80 100644
--- a/raw_eater.pxd
+++ b/raw_eater.pxd
@@ -26,4 +26,4 @@ cdef extern from "lib/raweat.hpp":
         vector[double] get_time()
         vector[double] get_data()
         # dump all data to .csv
-        void write_data(const char*)
+        void write_table(const char*,char delimiter)
diff --git a/raw_eater.pyx b/raw_eater.pyx
index 0586310..f91bb79 100644
--- a/raw_eater.pyx
+++ b/raw_eater.pyx
@@ -35,5 +35,5 @@ cdef class raweater:
     def get_channel(self):
         return self.rawit.get_data()
 
-    def print(self, const char* csvfile):
-        return self.rawit.write_data(csvfile)
+    def write_table(self, const char* csvfile, char delimiter):
+        return self.rawit.write_table(csvfile,delimiter)
diff --git a/src/main.cpp b/src/main.cpp
index 0e6b973..efc76f7 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -51,13 +51,14 @@ int main(int argc, char* argv[])
 //    //for ( auto el: segvec ) std::cout<<el<<"\n";
 //  }
 
-  // get array of encoded data 
+  // get array of encoded data
 //  std::vector<double> maindata = eatraw.get_data();
 //  std::cout<<"\nsize of data array: "<<maindata.size()<<"\n\n";
 //  for ( unsigned long int i = 0; i < 10; i++ ) std::cout<<mydata[i]<<"\n";
 
   // write data in csv-file
-  eatraw.write_data(std::string(argv[2]));
+  // eatraw.write_data(std::string(argv[2]));
+  eatraw.write_table(std::string(argv[2]),' ');
 
   return 0;
 }