diff --git a/geant4/LEM_FieldMaps/aew_8A_shortmumetal_ext.map b/geant4/LEM_FieldMaps/aew_8A_shortmumetal_ext.map
index 7049edd..09df939 100644
--- a/geant4/LEM_FieldMaps/aew_8A_shortmumetal_ext.map
+++ b/geant4/LEM_FieldMaps/aew_8A_shortmumetal_ext.map
@@ -1,4 +1,4 @@
-21	11	801	cm	-0.003357169234901
+11	11	401	cm	-0.003357169234901
 %nx	ny	nz	length_unit	norm_fact
 %
 -2.5	-2.5	-80	1.23	-0.56	-0.04