diff --git a/src/ctbin/ctbin.cpp b/src/ctbin/ctbin.cpp
index b25cbbf..3de0bd9 100644
--- a/src/ctbin/ctbin.cpp
+++ b/src/ctbin/ctbin.cpp
@@ -101,6 +101,10 @@ ctbin::~ctbin(void)
  ***************************************************************************/
 void ctbin::run(void)
 {
+    // Switch screen logging on in debug mode
+    if (logDebug())
+        log.cout(true);
+
     // Get parameters
     get_parameters();
 
diff --git a/src/ctbin/ctbin.hpp b/src/ctbin/ctbin.hpp
index 12a631a..71c4ffd 100644
--- a/src/ctbin/ctbin.hpp
+++ b/src/ctbin/ctbin.hpp
@@ -25,7 +25,7 @@
 
 /* __Definitions _________________________________________________________ */
 #define CTBIN_NAME    "ctbin"
-#define CTBIN_VERSION "v1r0p0"
+#define CTBIN_VERSION "00-01-00"
 
 
 /***********************************************************************//**
diff --git a/src/ctlike/ctlike.cpp b/src/ctlike/ctlike.cpp
index 338cde0..2c2e9b4 100644
--- a/src/ctlike/ctlike.cpp
+++ b/src/ctlike/ctlike.cpp
@@ -104,7 +104,10 @@ ctlike::~ctlike(void)
  ***************************************************************************/
 void ctlike::run(void)
 {
-    log.cout(true);
+    // Switch screen logging on in debug mode
+    if (logDebug())
+        log.cout(true);
+
     // Get parameters
     get_parameters();
 
@@ -304,7 +307,7 @@ void ctlike::init_members(void)
     m_outmdl.clear();
     m_models.clear();
     m_obs.clear();
-    m_max_iter = 1000;
+    m_max_iter = 100;
     m_logL     = 0.0;
     m_opt      = NULL;
 
diff --git a/src/ctlike/ctlike.hpp b/src/ctlike/ctlike.hpp
index 098529c..99834ed 100644
--- a/src/ctlike/ctlike.hpp
+++ b/src/ctlike/ctlike.hpp
@@ -1,7 +1,7 @@
 /***************************************************************************
  *                   ctlike - CTA maximum likelihood tool                  *
  * ----------------------------------------------------------------------- *
- *  copyright (C) 2010 by Jurgen Knodlseder                                *
+ *  copyright (C) 2010-2011 by Jurgen Knodlseder                           *
  * ----------------------------------------------------------------------- *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
@@ -26,7 +26,7 @@
 
 /* __Definitions _________________________________________________________ */
 #define CTLIKE_NAME    "ctlike"
-#define CTLIKE_VERSION "v1r0p0"
+#define CTLIKE_VERSION "00-01-00"
 
 
 /***********************************************************************//**
diff --git a/src/ctobssim/ctobssim.cpp b/src/ctobssim/ctobssim.cpp
index b7573a0..c45c1f7 100644
--- a/src/ctobssim/ctobssim.cpp
+++ b/src/ctobssim/ctobssim.cpp
@@ -101,6 +101,10 @@ ctobssim::~ctobssim(void)
  ***************************************************************************/
 void ctobssim::run(void)
 {
+    // Switch screen logging on in debug mode
+    if (logDebug())
+        log.cout(true);
+
     // Get parameters
     get_parameters();
 
diff --git a/src/ctobssim/ctobssim.hpp b/src/ctobssim/ctobssim.hpp
index 37f0d93..31b26e0 100644
--- a/src/ctobssim/ctobssim.hpp
+++ b/src/ctobssim/ctobssim.hpp
@@ -25,7 +25,7 @@
 
 /* __Definitions _________________________________________________________ */
 #define CTOBSSIM_NAME    "ctobssim"
-#define CTOBSSIM_VERSION "v1r0p0"
+#define CTOBSSIM_VERSION "00-01-00"
 
 
 /***********************************************************************//**
diff --git a/src/ctselect/ctselect.cpp b/src/ctselect/ctselect.cpp
index be3a4a8..ab0ae7d 100644
--- a/src/ctselect/ctselect.cpp
+++ b/src/ctselect/ctselect.cpp
@@ -109,6 +109,10 @@ ctselect::~ctselect(void)
  ***************************************************************************/
 void ctselect::run(void)
 {
+    // Switch screen logging on in debug mode
+    if (logDebug())
+        log.cout(true);
+
     // Get parameters
     get_parameters();
 
@@ -237,21 +241,48 @@ void ctselect::select(void)
 
 /***********************************************************************//**
  * @brief Append GTI to FITS file
+ *
+ * @todo We implement here a dummy method that overwrites an existing GTI
+ *       entry but that only works if a single time interval exists. This
+ *       is not clean, but since we have no method so far that allows
+ *       deleting a HDU from a FITS file we have no other choice. Ideally,
+ *       we would like to first delete an existing HDU and then append
+ *       a new one. If this is not possible, we would like to delete the
+ *       rows from an existing GTI and then fill it up anew. But in any
+ *       case, the actual data selection method does not check the
+ *       existing GTI, which we have to do to merge any subselection
+ *       information in. In fact, we need a GTI merge method as well ...
  ***************************************************************************/
 void ctselect::append_gti(void)
 {
-    // Allocate Gti
-    GGti gti;
-
-    // Setup single GTI covering the selected time range
+    // Setup selected time range
     GTime tstart;
     GTime tstop;
     tstart.met(m_tmin);
     tstop.met(m_tmax);
-    gti.add(tstart, tstop);
 
-    // Write GTI
-    gti.write(&m_file);
+    // Initialise empty GTI table HDU
+    GFitsTable* hdu = NULL;
+    
+    // Write selected time interval, either in an existing GTI or in a new
+    // GTI that is appended to the FITS file
+    try {
+        hdu = m_file.table("GTI");
+        GFitsTableDoubleCol* start = (GFitsTableDoubleCol*)hdu->column("START");
+        GFitsTableDoubleCol* stop  = (GFitsTableDoubleCol*)hdu->column("STOP");
+        (*start)(0) = tstart.met();
+        (*stop)(0)  = tstop.met();
+    }
+    catch (GException::fits_hdu_not_found) {
+        // Allocate Gti
+        GGti gti;
+
+        // Setup single GTI covering the selected time range
+        gti.add(tstart, tstop);
+
+        // Write GTI
+        gti.write(&m_file);
+    }
 
     // Log final FITS file
     if (logExplicit()) {
diff --git a/src/ctselect/ctselect.hpp b/src/ctselect/ctselect.hpp
index 2b3687f..04f4235 100644
--- a/src/ctselect/ctselect.hpp
+++ b/src/ctselect/ctselect.hpp
@@ -24,7 +24,7 @@
 
 /* __Definitions _________________________________________________________ */
 #define CTSELECT_NAME    "ctselect"
-#define CTSELECT_VERSION "v1r0p0"
+#define CTSELECT_VERSION "00-01-00"
 
 
 /***********************************************************************//**