diff --git a/extract_all.cpp b/extract_all.cpp
new file mode 100644
index 0000000..4e3fc48
--- /dev/null
+++ b/extract_all.cpp
@@ -0,0 +1,40 @@
+
+
+#include "lib/tdm_ripper.hpp"
+
+int main(int argc, char* argv[])
+{
+  // list of arguments: a) tdm file b) tdx file c) optional argument: output directory, default is ./
+  assert( argc == 3 || argc == 4 );
+
+  // declare and initialize tdm_ripper with two arguments specifying the files
+  tdm_ripper ripper(argv[1],argv[2],true);
+
+  // use given or default directory for output
+  std::string outdir;
+  outdir = ( argc == 4 ) ? argv[3] : "./" ;
+
+  ripper.print_hash_local((outdir+"hash_table_xml_local.dat").c_str());
+  ripper.print_hash_values((outdir+"hash_table_xml_value.dat").c_str());
+  ripper.print_hash_double((outdir+"hash_table_xml_double.dat").c_str());
+  ripper.print_extid((outdir+"channel_ext_id.dat").c_str());
+
+  std::ofstream gout((outdir+"list_of_groups.dat").c_str());
+  ripper.list_groups(gout);
+  gout.close();
+
+  std::ofstream fout((outdir+"list_of_channels.dat").c_str());
+  ripper.list_channels(fout);
+  fout.close();
+
+  // print all meta information
+  ripper.print_meta((outdir+"meta_info.csv").c_str());
+
+  for ( int i = 0; i < ripper.num_channels(); i++ )
+  {
+    ripper.print_channel(i,(outdir+"channel_"+std::to_string(i+1)+"_"
+                                  +ripper.channel_name(i)+".dat").c_str());
+  }
+
+  return 0;
+}
diff --git a/lib/tdm_ripper.cpp b/lib/tdm_ripper.cpp
index c2847d9..b919f59 100644
--- a/lib/tdm_ripper.cpp
+++ b/lib/tdm_ripper.cpp
@@ -259,6 +259,9 @@ void tdm_ripper::parse_structure()
   // std::string keyinit("usi23258");
   // std::cout<<"xml test "<<xml_double_sequence_[xml_values_[xml_local_columns_[keyinit]]]<<"\n\n";
 
+  // for ( auto el: minmax_ ) std::cout<<el.first<<"  "<<el.second<<"\n";
+  // std::cout<<"\n\n";
+
   // check consistency of number of channel-groups
   int numgroups = count_occ_string(subtreedata.child("tdm_root").child_value("channelgroups"),"id");
   assert( (neglect_empty_groups_ && numgroups == num_groups_+num_empty_groups_)
@@ -544,10 +547,8 @@ std::vector<double> tdm_ripper::get_channel(int channelid)
   // check if converted value is within expected range
   for ( int i = 0; i < (int)chann.size(); i++ )
   {
-    // if ( chann[i] < minmax_[channelid-1].first
-    //   || chann[i] > minmax_[channelid-1].second ) std::cout<<std::setw(20)<<chann[i]<<std::setw(20)<<minmax_[channelid-1].first<<std::setw(20)<<minmax_[channelid-1].second<<"\n";
-    assert( chann[i] >= minmax_[channelid-1].first  - 1.0e-6
-         && chann[i] <= minmax_[channelid-1].second + 1.0e-6 );
+    assert( chann[i] >= minmax_[channelid].first  - 1.0e-6
+         && chann[i] <= minmax_[channelid].second + 1.0e-6 );
   }
 
   return chann;
diff --git a/makefile b/makefile
index 3e59e63..6e0c0da 100644
--- a/makefile
+++ b/makefile
@@ -15,9 +15,16 @@ main.o : main.cpp
 tdm_ripper.o : lib/tdm_ripper.cpp lib/tdm_ripper.hpp
 	$(CC) -c $(CPPFLAGS) -I $(LIB) $< -o $@
 
+extall : extract_all.o tdm_ripper.o
+	$(CC) $(CPPFLAGS) $^ -o extract_all
+
+extract_all.o : extract_all.cpp
+	$(CC) -c $(CPPFLAGS) -I $(LIB) $< -o $@
+
 clean :
 	rm -f $(EXE) *.o
 	rm -f *.dat
+	rm -f extract_all
 	rm -f data/*.dat
 	rm -f data/*.csv