diff --git a/src/db/db/dbD25TechnologyComponent.cc b/src/db/db/dbD25TechnologyComponent.cc
index f710d829a..1ab0ed2ea 100644
--- a/src/db/db/dbD25TechnologyComponent.cc
+++ b/src/db/db/dbD25TechnologyComponent.cc
@@ -237,8 +237,31 @@ D25TechnologyComponent::compile_from_source (const std::string &src)
             info.set_zstop (z1.to_double ());
           }
         } else if (args.size () == 1) {
-          info.set_zstop ((! z0.is_nil () ? z0.to_double () : info.zstart ()) + args[0]);
+          if (! h.is_nil ()) {
+            if (! z0.is_nil ()) {
+              throw tl::Exception (tl::to_string (tr ("Rundundant parameters: zstart already given")));
+            }
+            if (! z1.is_nil ()) {
+              throw tl::Exception (tl::to_string (tr ("Rundundant parameters: zstop implicitly given")));
+            }
+            info.set_zstart (args[0]);
+            info.set_zstop (args[0] + h.to_double ());
+          } else {
+            if (! z1.is_nil ()) {
+              throw tl::Exception (tl::to_string (tr ("Rundundant parameters: zstop implicitly given")));
+            }
+            info.set_zstop ((! z0.is_nil () ? z0.to_double () : info.zstart ()) + args[0]);
+          }
         } else if (args.size () == 2) {
+          if (! z0.is_nil ()) {
+            throw tl::Exception (tl::to_string (tr ("Rundundant parameters: zstart already given")));
+          }
+          if (! z1.is_nil ()) {
+            throw tl::Exception (tl::to_string (tr ("Rundundant parameters: zstop already given")));
+          }
+          if (! h.is_nil ()) {
+            throw tl::Exception (tl::to_string (tr ("Rundundant parameters: height implicitly given")));
+          }
           info.set_zstart (args[0]);
           info.set_zstop (args[1]);
         } else {
diff --git a/src/db/unit_tests/dbD25TechnologyComponentTests.cc b/src/db/unit_tests/dbD25TechnologyComponentTests.cc
index 3dc872953..181ccb92a 100644
--- a/src/db/unit_tests/dbD25TechnologyComponentTests.cc
+++ b/src/db/unit_tests/dbD25TechnologyComponentTests.cc
@@ -39,6 +39,9 @@ TEST(1)
   comp.compile_from_source ("1/0: zstart=1.0 height=0.5");
   EXPECT_EQ (comp.to_string (), "1/0: zstart=1, zstop=1.5");
 
+  comp.compile_from_source ("1/0: 1.0 height=0.5");
+  EXPECT_EQ (comp.to_string (), "1/0: zstart=1, zstop=1.5");
+
   comp.compile_from_source ("1/0: zstop=1.5 height=0.5");
   EXPECT_EQ (comp.to_string (), "1/0: zstart=1, zstop=1.5");
 
diff --git a/src/laybasic/laybasic/D25TechnologyComponentEditor.ui b/src/laybasic/laybasic/D25TechnologyComponentEditor.ui
index 5a8b631cd..b1901ba63 100644
--- a/src/laybasic/laybasic/D25TechnologyComponentEditor.ui
+++ b/src/laybasic/laybasic/D25TechnologyComponentEditor.ui
@@ -13,15 +13,31 @@
   <property name="windowTitle">
    <string>Settings</string>
   </property>
-  <layout class="QVBoxLayout" name="verticalLayout">
-   <item>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="0" column="0">
     <widget class="QLabel" name="label">
      <property name="text">
       <string>2.5d Vertical Stack Information</string>
      </property>
     </widget>
    </item>
-   <item>
+   <item row="0" column="1">
+    <widget class="QLabel" name="lnum_label">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="text">
+      <string>Line</string>
+     </property>
+     <property name="alignment">
+      <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="0" colspan="2">
     <widget class="QTextEdit" name="src_te">
      <property name="font">
       <font>
diff --git a/src/laybasic/laybasic/layD25TechnologyComponent.cc b/src/laybasic/laybasic/layD25TechnologyComponent.cc
index 4935360f1..c004b4a1f 100644
--- a/src/laybasic/laybasic/layD25TechnologyComponent.cc
+++ b/src/laybasic/laybasic/layD25TechnologyComponent.cc
@@ -52,6 +52,15 @@ D25TechnologyComponentEditor::D25TechnologyComponentEditor (QWidget *parent)
   input.close ();
 
   hl->setDocument (src_te->document ());
+
+  connect (src_te, SIGNAL (cursorPositionChanged ()), this, SLOT (cursor_position_changed ()));
+}
+
+void
+D25TechnologyComponentEditor::cursor_position_changed ()
+{
+  int line = src_te->textCursor ().block ().firstLineNumber () + 1;
+  lnum_label->setText (tl::to_qstring (tl::sprintf (tl::to_string (tr ("Line %d")), line)));
 }
 
 void
diff --git a/src/laybasic/laybasic/layD25TechnologyComponent.h b/src/laybasic/laybasic/layD25TechnologyComponent.h
index aeec28b7e..206838b70 100644
--- a/src/laybasic/laybasic/layD25TechnologyComponent.h
+++ b/src/laybasic/laybasic/layD25TechnologyComponent.h
@@ -44,6 +44,9 @@ public:
   void commit ();
   void setup ();
 
+private slots:
+  void cursor_position_changed ();
+
 private:
   std::auto_ptr<lay::GenericSyntaxHighlighterAttributes> mp_hl_attributes, mp_hl_basic_attributes;
 };
diff --git a/src/laybasic/laybasic/syntax/d25_text.xml b/src/laybasic/laybasic/syntax/d25_text.xml
index 654dd7c93..5e0877b74 100644
--- a/src/laybasic/laybasic/syntax/d25_text.xml
+++ b/src/laybasic/laybasic/syntax/d25_text.xml
@@ -63,7 +63,7 @@
 			<itemData name="Comment" defStyleNum="dsComment"/>
 			<itemData name="Float" defStyleNum="dsFloat"/>
 			<itemData name="Dec" defStyleNum="dsDecVal"/>
-			<itemData name="Symbol" defStyleNum="dsString" color="#D40000"/>
+			<itemData name="Symbol" defStyleNum="dsKeyword"/>
 			<itemData name="String" defStyleNum="dsString"/>
 			<itemData name="Raw String" defStyleNum="dsString" color="#DD4A4A" selColor="#DD4A4A"/>