diff --git a/IV/Makefile b/IV/Makefile
index b847518..49a6428 100644
--- a/IV/Makefile
+++ b/IV/Makefile
@@ -102,7 +102,7 @@ mj-msc.pdf: mj-msc.tex version.inc.tex vars.inc.tex bib.bib \
 define FIG_template
 $(1).pdf: layer2img.py Makefile $(2)
 	python3 ./layer2img.py --outfile=$(1).pdf \
-		$$(if $$($(1)_LEGEND),--legend=$$($(1)_LEGEND)) \
+		$$(if $$($(1)_LEGEND),--legend="$$($(1)_LEGEND)") \
 		$$(if $$($(1)_WIDTHDIV),--widthdiv=$$($(1)_WIDTHDIV)) \
 		$$(if $$($(1)_QUADRANT),--quadrant=$$($(1)_QUADRANT)) \
 		$$(foreach i,1 2 3, \
@@ -269,17 +269,6 @@ salvis-wm-dp-chaikin-50k_1COLOR  = green
 salvis-wm-dp-chaikin-50k_2COLOR  = orange
 salvis-wm-dp-chaikin-50k_3LINESTYLE  = dotted
 
-salvis-wm-vw-50k_1SELECT    = wm_visuals where name='salvis-vw-64'
-salvis-wm-vw-50k_2SELECT    = wm_visuals where name='salvis-wm-75'
-salvis-wm-vw-50k_3SELECT    = wm_visuals where name='salvis'
-salvis-wm-vw-50k_1COLOR     = green
-salvis-wm-vw-50k_1LABEL     = Visvalingam--Whyatt
-salvis-wm-vw-50k_2COLOR     = orange
-salvis-wm-vw-50k_2LABEL     = Wang--Müller
-salvis-wm-vw-50k_3LINESTYLE = dotted
-salvis-wm-vw-50k_3LABEL     = GRPK
-salvis-wm-vw-50k_LEGEND     = "lower left"
-
 salvis-wm-vw-chaikin-50k_1SELECT = wm_visuals where name='salvis-vw-64-chaikin'
 salvis-wm-vw-chaikin-50k_2SELECT = wm_visuals where name='salvis-wm-75'
 salvis-wm-vw-chaikin-50k_3SELECT = wm_visuals where name='salvis'
@@ -287,6 +276,26 @@ salvis-wm-vw-chaikin-50k_1COLOR  = green
 salvis-wm-vw-chaikin-50k_2COLOR  = orange
 salvis-wm-vw-chaikin-50k_3LINESTYLE  = dotted
 
+label_wm 		 = Wang--Müller
+label_vw 		 = Visvalingam--Whyatt
+label_dp 		 = Douglas \& Peucker
+label_vw-chaikin = $(label_vw) and Chaikin
+label_dp-chaikin = $(label_dp) and Chaikin
+
+define wm_vwdp50k
+RIVERS += salvis-wm-$(1)-50k
+salvis-wm-$(1)-50k_1SELECT    = wm_visuals where name='salvis-$(1)-64'
+salvis-wm-$(1)-50k_3SELECT    = wm_visuals where name='salvis'
+salvis-wm-$(1)-50k_1COLOR     = green
+salvis-wm-$(1)-50k_1LABEL     = $(label_$(1))
+salvis-wm-$(1)-50k_2COLOR     = orange
+salvis-wm-$(1)-50k_2LABEL     = $(label_wm)
+salvis-wm-$(1)-50k_3LINESTYLE = dotted
+salvis-wm-$(1)-50k_3LABEL     = GRPK 1:\\numprint{10000}
+salvis-wm-$(1)-50k_LEGEND     = lower left
+endef
+$(foreach x,vw dp vw-chaikin dp-chaikin,$(eval $(call wm_vwdp50k,$(x))))
+
 
 .faux_db_pre: db init.sql
 	bash db start
diff --git a/IV/layer2img.py b/IV/layer2img.py
index 185e139..a3a90cb 100644
--- a/IV/layer2img.py
+++ b/IV/layer2img.py
@@ -111,6 +111,7 @@ def main():
     c3 = plot_args(g3, args.g3_color, args.g3_linestyle, args.g3_label)
 
     rc('text', usetex=True)
+    rc('text.latex', preamble='\\usepackage{numprint}\n')
     fig, ax = plt.subplots(constrained_layout=True)
     fig.set_figwidth(inch(width))