diff --git a/IV/Makefile b/IV/Makefile
index f0fdec4..53eb11e 100644
--- a/IV/Makefile
+++ b/IV/Makefile
@@ -3,6 +3,9 @@ WHERE ?= name='Visinčia' OR name='Šalčia' OR name='Nemunas' OR name='Merkys'
 #WHERE ?= name like '%'
 SLIDES = slides-2021-03-29.pdf
 
+# Max figure size (in meters) is when it's width is TEXTWIDTH_CM on scale 1:25k
+SCALEDWIDTH = $(shell awk '/^TEXTWIDTH_CM/{print 25000/100*$$3}' layer2img.py)
+
 ##############################################################################
 # These variables have to come before first use due to how macros are expanded
 ##############################################################################
@@ -68,7 +71,6 @@ mj-msc.pdf: mj-msc.tex version.inc.tex vars.inc.tex bib.bib \
 define FIG_template
 $(1).pdf: layer2img.py Makefile $(2)
 	python ./layer2img.py --outfile=$(1).pdf \
-		$$(if $$($(1)_WMCLIP),--wmclip=$$($(1)_WMCLIP)) \
 		$$(if $$($(1)_WIDTHDIV),--widthdiv=$$($(1)_WIDTHDIV)) \
 		$$(foreach i,1 2 3, \
 			$$(if $$($(1)_$$(i)CMAP),--group$$(i)-cmap="$$($(1)_$$(i)CMAP)") \
@@ -122,19 +124,16 @@ selfcrossing-1-after_2SELECT = wm_debug where name='selfcrossing-1' AND stage='b
 selfcrossing-1-after_2LINESTYLE = invisible
 
 salvis-25k_1SELECT = wm_rivers where name='Šalčia' OR name='Visinčia'
-salvis-25k_WMCLIP = salcia-visincia:25k
 salvis-25k_WIDTHDIV = 1
 
-salvis-50k_WIDTHDIV = 2
 salvis-50k_1SELECT = wm_rivers where name='Šalčia' OR name='Visinčia'
-salvis-50k_WMCLIP = salcia-visincia:50k
+salvis-50k_WIDTHDIV = 2
 
-salvis-250k_WIDTHDIV = 10
 salvis-250k_1SELECT = wm_rivers where name='Šalčia' OR name='Visinčia'
-salvis-250k_WMCLIP = salcia-visincia:250k
+salvis-250k_WIDTHDIV = 10
 
 .faux_test-rivers: tests-rivers.sql wm.sql .faux_db
-	./db -f $<
+	./db -v scaledwidth=$(SCALEDWIDTH) -f $<
 	touch $@
 
 .faux_test: tests.sql wm.sql .faux_db
diff --git a/IV/layer2img.py b/IV/layer2img.py
index 324a62f..26226b7 100644
--- a/IV/layer2img.py
+++ b/IV/layer2img.py
@@ -16,45 +16,39 @@ PSQL_CREDS = "host=127.0.0.1 dbname=osm user=osm password=osm"
 # see `NOTICE` in the LaTeX document; this is the width of the main text block.
 TEXTWIDTH_CM = 12.12364
 
-SCALES = {
-    "10k": 10000,
-    "25k": 25000,
-    "50k": 50000,
-    "250k": 250000,
-}
 
 def inch(cm):
     return cm / 2.54
 
-def wm_clip(string):
-    if not string:
-        return None
-    name, gdr = string.split(":")
-    if scale := SCALES.get(gdr):
-        return name, scale
-    scales = ",".join(SCALES.keys())
-    raise argparse.ArgumentTypeError("invalid scale. Expected %s" % scales)
-
 
 def parse_args():
     parser = argparse.ArgumentParser(
-            description='Convert geopackage to an image')
+            description='Convert a geometry to an image')
     parser.add_argument('--group1-select', required=True)
     parser.add_argument('--group1-cmap', type=bool)
     parser.add_argument('--group1-linestyle')
 
+    simplify = parser.add_mutually_exclusive_group()
+    simplify.add_argument('--group1-simplifydp', type=int)
+    simplify.add_argument('--group1-simplifyvw', type=int)
+    parser.add_argument('--group1-chaikin', type=bool)
+
     parser.add_argument('--group2-select')
     parser.add_argument('--group2-cmap', type=bool)
     parser.add_argument('--group2-linestyle')
+    simplify = parser.add_mutually_exclusive_group()
+    simplify.add_argument('--group2-simplifydp', type=int)
+    simplify.add_argument('--group2-simplifyvw', type=int)
+    parser.add_argument('--group2-chaikin', type=bool)
 
     parser.add_argument('--group3-select')
     parser.add_argument('--group3-cmap', type=bool)
     parser.add_argument('--group3-linestyle')
+    simplify = parser.add_mutually_exclusive_group()
+    simplify.add_argument('--group3-simplifydp', type=int)
+    simplify.add_argument('--group3-simplifyvw', type=int)
+    parser.add_argument('--group3-chaikin', type=bool)
 
-    parser.add_argument('--wmclip',
-                        type=wm_clip,
-                        help="Clip for scale. E.g. salcia-visincia:10k",
-                        )
     parser.add_argument('--widthdiv',
                         default=1, type=float, help='Width divisor')
 
@@ -62,17 +56,10 @@ def parse_args():
     return parser.parse_args()
 
 
-def read_layer(select, width, maybe_wmclip):
+def read_layer(select, width):
     if not select:
         return
     way = "way"
-    if maybe_wmclip:
-        name, scale = maybe_wmclip
-        way = "st_intersection(way, wm_bbox('{name}', {scale}, {width}))".format(
-                name=name,
-                scale=scale,
-                width=width,
-        )
     conn = psycopg2.connect(PSQL_CREDS)
     sql = "SELECT {way} as way1 FROM {select}".format(way=way, select=select)
     return geopandas.read_postgis(sql, con=conn, geom_col='way1')
@@ -93,9 +80,9 @@ def plot_args(color, maybe_cmap, maybe_linestyle):
 def main():
     args = parse_args()
     width = TEXTWIDTH_CM / args.widthdiv
-    group1 = read_layer(args.group1_select, width, args.wmclip)
-    group2 = read_layer(args.group2_select, width, args.wmclip)
-    group3 = read_layer(args.group3_select, width, args.wmclip)
+    group1 = read_layer(args.group1_select, width)
+    group2 = read_layer(args.group2_select, width)
+    group3 = read_layer(args.group3_select, width)
     c1 = plot_args(BLACK, args.group1_cmap, args.group1_linestyle)
     c2 = plot_args(ORANGE, args.group2_cmap, args.group2_linestyle)
     c3 = plot_args(GREEN, args.group3_cmap, args.group3_linestyle)
diff --git a/IV/mj-msc.tex b/IV/mj-msc.tex
index 410ded3..3f57b0c 100644
--- a/IV/mj-msc.tex
+++ b/IV/mj-msc.tex
@@ -3,7 +3,6 @@
 \usepackage[T1]{fontenc}
 \usepackage[english]{babel}
 \usepackage[utf8]{inputenc}
-%\usepackage{a4wide}
 \usepackage [autostyle, english=american]{csquotes}
 \MakeOuterQuote{"}
 \usepackage[maxbibnames=99,style=numeric,sorting=none]{biblatex}
@@ -19,8 +18,18 @@
 \usepackage{tabularx}
 \usepackage{float}
 \usepackage{tikz}
-\usepackage{minted}
 \usepackage{fancyvrb}
+
+\iffalse
+% requires minted
+\usepackage{minted}
+\newcommand{\inputcode}[2]{\inputminted[fontsize=\small}{#1}{#2}
+\else
+% does not require minted
+\usepackage{verbatim}
+\newcommand{\inputcode}[2]{\verbatiminput{#2}}
+\fi
+
 \input{version.inc}
 \input{vars.inc}
 
@@ -189,6 +198,7 @@ As can be seen in the article example, generalization is worthy.
 \end{figure}
 
 
+
 \subsubsection{Modern approaches}
 
 Due to their simplicity and ubiquity, {\DP} and {\VW} have been established as
@@ -617,12 +627,12 @@ We strongly believe in the ability to reproduce the results is critical for any
     document and its accompanying graphics, run this script (assuming name of
     this document is {\tt mj-msc-full.pdf}):
 
-\inputminted[fontsize=\small]{bash}{extract-and-generate}
+\inputcode{bash}{extract-and-generate}
 
 This was tested on Linux Debian 11 with upstream packages only.
 
 \subsection{Algorithm code listings}
-\inputminted[fontsize=\small]{postgresql}{wm.sql}
+\inputcode{postgresql}{wm.sql}
 
 \end{appendices}
 \end{document}
diff --git a/IV/tests-rivers.sql b/IV/tests-rivers.sql
index 892e29f..d3bc410 100644
--- a/IV/tests-rivers.sql
+++ b/IV/tests-rivers.sql
@@ -1,49 +1,40 @@
 \i wm.sql
 
-insert into wm_visuals(name, way) values('salcia-visincia',
-  st_closestpoint(
-    (select way from wm_rivers where name='Šalčia'),
-    (select way from wm_rivers where name='Visinčia')
-  )
-);
-
-insert into wm_visuals(name, way) values('nemunas-merkys',
-  st_closestpoint(
-    (select way from wm_rivers where name='Nemunas'),
-    (select way from wm_rivers where name='Merkys')
-  )
-);
-
-
 -- wm_envelope clips a geometry by a bounding box around a given object,
 -- matching dimensions of A-class paper (1 by sqrt(2).
 drop function if exists wm_bbox;
 create function wm_bbox(
-  center text,
-  projection_scale integer,
-  projection_width_cm float
+  center geometry,
+  scaledwidth float
 ) returns geometry as $$
 declare
-  gcenter geometry;
   halfX float;
   halfY float;
 begin
-  halfX = projection_scale * projection_width_cm / 2 / 100;
+  halfX = scaledwidth / 2;
   halfY = halfX * sqrt(2);
-  select way from wm_visuals where name=center into gcenter;
-  if gcenter is null then
-    raise 'center % not found', center;
-  end if;
-
   return st_envelope(
     st_union(
-      st_translate(gcenter, halfX, halfY),
-      st_translate(gcenter, -halfX, -halfY)
+      st_translate(center, halfX, halfY),
+      st_translate(center, -halfX, -halfY)
     )
   );
 end
 $$ language plpgsql;
 
+insert into wm_visuals(name, way) values('salvis', (
+    select st_intersection(
+      (select st_union(way) from wm_rivers where name in ('Šalčia', 'Visinčia')),
+      wm_bbox(
+        st_closestpoint(
+          (select way from wm_rivers where name='Šalčia'),
+          (select way from wm_rivers where name='Visinčia')
+        ),
+        :scaledwidth
+      )
+    )
+));
+
 do $$
 declare
   npoints bigint;