diff --git a/python/obitools3/format/tab.pyx b/python/obitools3/format/tab.pyx
index 052b2bd..a6e527c 100755
--- a/python/obitools3/format/tab.pyx
+++ b/python/obitools3/format/tab.pyx
@@ -9,7 +9,7 @@ from obitools3.dms.column.column cimport Column_line
 cdef class TabFormat:
     
     def __init__(self, header=True, bytes NAString=b"NA", bytes sep=b"\t"):
-        self.header = True
+        self.header = header
         self.first_line = True
         self.NAString = NAString
         self.sep = sep
@@ -36,7 +36,7 @@ cdef class TabFormat:
                 if value is None:
                     value = self.NAString
             
-            line.append(value)   
+            line.append(value)
       	
         if self.first_line:
             self.first_line = False