diff --git a/include/plot.h b/include/plot.h
index c198616325d54d73ae5e4c08f5ba7113ae77f817..503e82036a817effb285e637b1ba8e22bedcbd3f 100644
--- a/include/plot.h
+++ b/include/plot.h
@@ -10,6 +10,7 @@
 #include <vector>
 
 namespace plot {
+  const int kArgonneBlue   = TColor::GetColor(0x1f, 0x77, 0xb4); // not really
 
   const int kMpBlue   = TColor::GetColor(0x1f, 0x77, 0xb4);
   const int kMpOrange = TColor::GetColor(0xff, 0x7f, 0x0e);