diff --git a/.gitignore b/.gitignore
index e2204a2..00fb415 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,4 +8,5 @@
 /7days.*
 /allmonths.txt
 /feed_*.xml
+/humidex.*
 /rose_*
diff --git a/index.php b/index.php
index 97e701d..bdd700e 100644
--- a/index.php
+++ b/index.php
@@ -139,19 +139,19 @@
     </div>
 
     <div><!-- 2009 -->
-        <img src="2009.png" />
+        <img src="2009.svg" />
     </div>
 
     <div><!-- 2010 -->
-        <img src="2010.png" />
+        <img src="2010.svg" />
     </div>
 
     <div><!-- 2011 -->
-        <img src="2011.png" />
+        <img src="2011.svg" />
     </div>
 
     <div><!-- 2012 -->
-        <img src="2012.png" />
+        <img src="2012.svg" />
     </div>
 
     <div><!-- 2016 -->