diff --git a/latex/presentations/midterm/presentation.tex b/latex/presentations/midterm/presentation.tex
index 233c1b3..6090b66 100644
--- a/latex/presentations/midterm/presentation.tex
+++ b/latex/presentations/midterm/presentation.tex
@@ -140,9 +140,10 @@
 \AtBeginSubsubsection[]{}
 \AtBeginSubsection[]{}
 
+
 \pgfplotsset{
     discard if/.style 2 args={
-        x filter/.code={
+        x filter/.append code={
             \edef\tempa{\thisrow{#1}}
             \edef\tempb{#2}
             \ifx\tempa\tempb
@@ -151,7 +152,7 @@
         }
     },
     discard if not/.style 2 args={
-        x filter/.code={
+        x filter/.append code={
             \edef\tempa{\thisrow{#1}}
             \edef\tempb{#2}
             \ifx\tempa\tempb
@@ -159,6 +160,15 @@
                 \def\pgfmathresult{inf}
             \fi
         }
+    },
+    discard if gt/.style 2 args={
+        x filter/.append code={
+            \edef\tempa{\thisrow{#1}}
+            \edef\tempb{#2}
+            \ifdim\tempa pt > \tempb pt
+                \def\pgfmathresult{inf}
+            \fi
+        }
     }
 }