diff --git a/IV/Makefile b/IV/Makefile
index a52d0e4..2b4dc73 100644
--- a/IV/Makefile
+++ b/IV/Makefile
@@ -48,7 +48,7 @@ RIVERS = \
 		 salvis-wm-50k-ne \
 		 salvis-wm-overlaid-250k-zoom \
 		 salvis-wm-grpk50 \
-		 salvis-wm-grpk50-ne \
+		 salvis-wm75-grpk50-grpk10ne \
 		 salvis-wm220
 
 ################################################################################
@@ -191,13 +191,6 @@ salvis-wm-grpk50_1COLOR = orange
 salvis-wm-grpk50_2COLOR = green
 salvis-wm-grpk50_3LINESTYLE = dotted
 
-salvis-wm-grpk50-ne_1SELECT = wm_visuals where name='salvis-wm75'
-salvis-wm-grpk50-ne_2SELECT = wm_visuals where name='salvis-grpk50'
-salvis-wm-grpk50-ne_3SELECT = wm_visuals where name='salvis-grpk10'
-salvis-wm-grpk50-ne_1COLOR = orange
-salvis-wm-grpk50-ne_2COLOR = green
-salvis-wm-grpk50-ne_3LINESTYLE = dotted
-salvis-wm-grpk50-ne_QUADRANT = tl
 
 salvis-wm220_1SELECT = wm_visuals where name='salvis-wm220'
 salvis-wm220_WIDTHDIV = 2
@@ -206,11 +199,12 @@ label_wm75 = Wang--Müller
 label_vw64 = Visvalingam--Whyatt
 label_dp64 = Douglas \& Peucker
 label_grpk10 = GRPK 1:\numprint{10000}
+label_grpk50 = GRPK 1:\numprint{50000}
 label_vw64chaikin = $(label_vw64) and Chaikin
 label_dp64chaikin = $(label_dp64) and Chaikin
 legend_   = lower left
 legend_tr = lower right
-legend_tl = lower right
+legend_tl = lower center
 
 define wm_vwdp50k
 RIVERS += salvis-$(1)-$(2)-$(3)-50k$(4)
@@ -231,6 +225,7 @@ $(foreach x,vw64 dp64 vwchaikin64 dpchaikin64,\
 	$(eval $(call wm_vwdp50k,wm75,$(x),grpk10,tl)) \
 	$(eval $(call wm_vwdp50k,wm75,$(x),grpk10,tr)) \
 )
+$(eval $(call wm_vwdp50k,wm75,grpk50,grpk10,tr))
 
 define FIG_template
 $(1).pdf: layer2img.py Makefile $(2)
@@ -246,6 +241,7 @@ $(1).pdf: layer2img.py Makefile $(2)
 	)
 endef
 
+
 $(foreach fig,$(FIGURES),$(eval $(call FIG_template,$(fig),.faux_test)))
 $(foreach fig,$(RIVERS), $(eval $(call FIG_template,$(fig),.faux_visuals)))
 
diff --git a/IV/layer2img.py b/IV/layer2img.py
index 5046c3b..f5dc2a6 100644
--- a/IV/layer2img.py
+++ b/IV/layer2img.py
@@ -22,7 +22,7 @@ COLORS = {
 # see `NOTICE` in the LaTeX document; this is the width of the main text block.
 TEXTWIDTH_CM = 12.12364
 
-QUADRANTS = {'tl':1, 'tr':2, 'br':3, 'bl':4}
+QUADRANTS = {'tr':1, 'br':2, 'bl':3, 'tl':4}
 
 def color(string):
     return COLORS[string if string else 'black']
diff --git a/IV/mj-msc.tex b/IV/mj-msc.tex
index a54cb5b..2df5444 100644
--- a/IV/mj-msc.tex
+++ b/IV/mj-msc.tex
@@ -1526,12 +1526,12 @@ all three shapes: grpk50LT, {\WM}--simplified GDB10LT, and the original GDB10LT.
 
 \begin{figure}[h!]
     \centering
-    \includegraphics[width=\textwidth]{salvis-wm-grpk50-ne}
+    \includegraphics[width=\textwidth]{salvis-wm75-grpk50-grpk10-50ktr}
     \caption{Top--right side of Figure~\ref{fig:salvis-wm-grpk50}.}
-    \label{fig:salvis-wm-grpk50-ne}
+    \label{fig:salvis-wm75-grpk50-grpk10-50ktr}
 \end{figure}
 
-Although figures are almost identical, Figure~\ref{fig:salvis-wm-grpk50-ne}
+Although figures are almost identical, Figure~\ref{fig:salvis-wm75-grpk50-grpk10-50ktr}
 illustrates two small bends that have been removed in grpk50LT, but have been
 exaggerated by our implementation.