diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..f673a71
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "liveServer.settings.port": 5502
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index ac3c27b..7ef18c2 100644
--- a/README.md
+++ b/README.md
@@ -15,32 +15,32 @@ A dynamic, real-time ASCII-based vertical bar chart library that renders beautif
 ## Demo
 
 ```
-         Real-Time Data Visualization
+                    Real-Time Data Visualization
 
-C  20 | X X X X X X X X X X X X X X X X X X X X
-o  19 | X X X X X X X X X X X X X X X X X X X X
-u  18 | X X X X X X X X X X X X X X X X X X X X
-n  17 | X X X X X X X X X X X X X X X X X X X X
-t  16 | X X X X X X X X X X X X X X X X X X X X
-   15 | X X X X X X X X X X X X X X X X X X X X
-   14 | X X X X X X X X X X X X X X X X X X X X
-   13 | X X X X X X X X X X X X X X X X X X X X
-   12 | X X X X X X X X X X X X X X X X X X X X
-   11 | X X X X X X X X X X X X X X X X X X X X
-   10 | X X X X X X X X X X X X X X X X X X X X
-    9 | X X X X X X X X X X X X X X X X X X X X
-    8 | X X X X X X X X X X X X X X X X X X X X
-    7 | X X X X X X X X X X X X X X X X X X X X
-    6 | X X X X X X X X X X X X X X X X X X X X
-    5 | X X X X X X X X X X X X X X X X X X X X
-    4 | X X X X X X X X X X X X X X X X X X X X
-    3 | X X X X X X X X X X X X X X X X X X X X
-    2 | X X X X X X X X X X X X X X X X X X X X
-    1 | X X X X X X X X X X X X X X X X X X X X
-    +----------------------------------------
-      1    6   11   16   21   26   31   36   41
+  486 |                                                         X  
+  484 |                                                         X X
+  482 |                                                   X     X X
+  481 |                                                   X     X X
+  479 |                                             X X   X X X X X
+  477 |                                             X X X X X X X X
+  475 |                                           X X X X X X X X X
+C 473 |                                       X   X X X X X X X X X
+o 472 |                                   X X X X X X X X X X X X X
+u 470 |                             X X   X X X X X X X X X X X X X
+n 468 |                             X X X X X X X X X X X X X X X X
+t 466 |                     X     X X X X X X X X X X X X X X X X X
+  465 |                 X   X   X X X X X X X X X X X X X X X X X X
+  463 |           X     X X X X X X X X X X X X X X X X X X X X X X
+  461 |           X     X X X X X X X X X X X X X X X X X X X X X X
+  459 |     X     X     X X X X X X X X X X X X X X X X X X X X X X
+  457 |   X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
+  456 |   X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
+  454 |   X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
+  452 | X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
+      +------------------------------------------------------------
+       453        458        463        468        473        478        
 
-              Time (seconds)
+                              Time (seconds)
 ```
 
 ## Installation
@@ -48,7 +48,7 @@ t  16 | X X X X X X X X X X X X X X X X X X X X
 Simply include the JavaScript file in your HTML:
 
 ```html
-<script src="ascii-bar-chart.js"></script>
+<script src="text_graph.js"></script>
 ```
 
 ## Quick Start
@@ -70,7 +70,7 @@ Simply include the JavaScript file in your HTML:
 <body>
     <div id="chart"></div>
     
-    <script src="ascii-bar-chart.js"></script>
+    <script src="text_graph.js"></script>
     <script>
         // Create chart
         const chart = new ASCIIBarChart('chart', {
@@ -280,7 +280,7 @@ MIT License - feel free to use in your projects!
 
 ## Examples
 
-See [`ascii-bar-chart.html`](ascii-bar-chart.html) for a complete working example with:
+See [`text_graph.html`](text_graph.html) for a complete working example with:
 - Interactive controls (Start/Stop/Reset)
 - Configurable settings (update interval, max columns, chart height)
 - Test data generator with increasing trend
diff --git a/ascii-bar-chart.html b/text_graph.html
similarity index 98%
rename from ascii-bar-chart.html
rename to text_graph.html
index 81b9b26..f10005b 100644
--- a/ascii-bar-chart.html
+++ b/text_graph.html
@@ -93,7 +93,7 @@
     <div id="settings" style="margin-bottom: 15px; font-size: 12px;">
         <label>
             Update Interval (ms):
-            <input type="number" id="update-interval" value="1000" min="100" max="10000" step="100" style="width: 80px;">
+            <input type="number" id="update-interval" value="100" min="100" max="10000" step="100" style="width: 80px;">
         </label>
         <label style="margin-left: 15px;">
             Max Columns:
@@ -121,7 +121,7 @@
     </div>
 
     <!-- Include the ASCII Bar Chart library -->
-    <script src="ascii-bar-chart.js"></script>
+    <script src="text_graph.js"></script>
     
     <script>
         
@@ -141,7 +141,7 @@
         
         // Test data generator (separate from chart API)
         class DataGenerator {
-            constructor(updateInterval = 1000) {
+            constructor(updateInterval = 100) {
                 this.baseValue = 10;
                 this.intervalId = null;
                 this.countdownId = null;
diff --git a/ascii-bar-chart.js b/text_graph.js
similarity index 95%
rename from ascii-bar-chart.js
rename to text_graph.js
index 31586cd..44d734f 100644
--- a/ascii-bar-chart.js
+++ b/text_graph.js
@@ -139,8 +139,11 @@ class ASCIIBarChart {
             
             // Add vertical Y-axis label character
             if (this.yAxisLabel) {
-                const labelIndex = Math.floor((scale - row) / scale * this.yAxisLabel.length);
-                if (labelIndex < this.yAxisLabel.length) {
+                const L = this.yAxisLabel.length;
+                const startRow = Math.floor((scale - L) / 2) + 1;
+                const relativeRow = scale - row + 1; // 1 at top, scale at bottom
+                if (relativeRow >= startRow && relativeRow < startRow + L) {
+                    const labelIndex = relativeRow - startRow;
                     line += this.yAxisLabel[labelIndex] + ' ';
                 } else {
                     line += '  ';
