diff --git a/examples/hexagonal/modes/00_params.sh b/examples/hexagonal/modes/00_params.sh
index 3f512f2..050c80f 100644
--- a/examples/hexagonal/modes/00_params.sh
+++ b/examples/hexagonal/modes/00_params.sh
@@ -25,7 +25,7 @@ export B2Y_nmi=$(bc <<< '4*pi/3/'${SEPARATION_nm})
 
 # a K-point coordinates
 export KPOINTX_nmi=$(bc <<< '4*pi/3/sqrt(3)'/${SEPARATION_nm})
-export KPOINTY_nmi=$(bc <<< '4*pi/3/sqrt(3)'/${SEPARATION_nm})
+export KPOINTY_nmi=0.0 #$(bc <<< '4*pi/3/sqrt(3)'/${SEPARATION_nm})
 
 export RADIUS_nm=50
 export HEIGHT_nm=50
diff --git a/examples/hexagonal/modes/01a_realfreq_svd.sh b/examples/hexagonal/modes/01a_realfreq_svd.sh
new file mode 100755
index 0000000..64a2a75
--- /dev/null
+++ b/examples/hexagonal/modes/01a_realfreq_svd.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+MISCDIR=../../../misc
+
+source ${SCRIPTDIR}/00_params.sh
+
+${MISCDIR}/lat2d_realfreqsvd.py \
+       	-B $BG_REFINDEX \
+	-b s${A1X_nm}e-9 s${A1Y_nm}e-9 \
+	-b s${A2X_nm}e-9 s${A2Y_nm}e-9 \
+	-p s${P1X_nm}e-9 s${P1Y_nm}e-9 \
+	-p s${P2X_nm}e-9 s${P2Y_nm}e-9 \
+	-L 3 -m $METAL -r ${RADIUS_nm}e-9 -H ${HEIGHT_nm}e-9 \
+	-k s${KPOINTX_nmi}e9 s${KPOINTY_nmi}e9 \
+	-F 1.3 0.001 1.5 \
+	-P
diff --git a/qpms/argproc.py b/qpms/argproc.py
index b947ff2..cc48d78 100644
--- a/qpms/argproc.py
+++ b/qpms/argproc.py
@@ -114,6 +114,20 @@ def sfloat(string):
         else: raise exc
     return res
 
+def sint(string):
+    '''Tries to match an int, or an int with prepended 's'
+
+    Used as a workaraound for argparse's negative number matcher if '+' is used as a
+    prefix 
+    '''
+    try:
+        res = int(string)
+    except ValueError as exc:
+        if string[0] == 's':
+            res = int(string[1:])
+        else: raise exc
+    return res
+
 def material_spec(string):
     """Tries to parse a string as a material specification, i.e. a 
     real or complex number or one of the string in built-in Lorentz-Drude models.