diff --git a/data/sf.svg b/data/sf.svg
index c6d7338..6cd9ccd 100644
--- a/data/sf.svg
+++ b/data/sf.svg
@@ -1,4 +1,4 @@
-<svg width="100%%" height="100%%" viewBox="-787.468 -747.988 1541.5 1537.12" preserveAspectRatio="xMidyMid" xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink"><path d="M-100000 0L100000 0M0 -100000L0 100000" stroke="green" stroke-dasharray="20 20"/><path fill="none" stroke="black" stroke-linecap="round"  d="M100 -0L100.17 -1.75
+<svg width="100%" height="100%" viewBox="-787.468 -747.988 1541.5 1537.12" preserveAspectRatio="xMidyMid" xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink"><path d="M-100000 0L100000 0M0 -100000L0 100000" stroke="green" stroke-dasharray="20 20"/><path fill="none" stroke="black" stroke-linecap="round"  d="M100 -0L100.17 -1.75
 M100.17 -1.75L100.69 -3.52
 M100.69 -3.52L101.56 -5.32
 M101.56 -5.32L102.79 -7.19
diff --git a/main.c b/main.c
index 3267032..d0808c6 100644
--- a/main.c
+++ b/main.c
@@ -116,21 +116,26 @@ int main(int argc, char **argv) {
       "preserveAspectRatio=\"xMidyMid\" "
       "xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" "
       "xmlns:xlink=\"http://www.w3.org/1999/xlink\">"
-      "<path d=\"M-100000 0L100000 0M0 -100000L0 100000\" stroke=\"green\" "
-      "stroke-dasharray=\"20 20\"/>";
+      "<path stroke=\"green\" stroke-dasharray=\"20 20\" d=\"";
 
     auto print_seg = [](const Segment &s) {
         std::cout << "M" << s.p.x << " " << -s.p.y
                   << "L" << s.q.x << " " << -s.q.y << "\n";
     };
 
+    Segment xaxis {{-2 * d_x, 0}, {2 * d_x, 0}};
+    Segment yaxis {{0, -2 * d_y}, {0, 2 * d_y}};
+    print_seg(xaxis);
+    print_seg(yaxis);
+    std::cout << "\"/>";
+
     std::cout << "<path fill=\"none\" stroke=\"black\" "
                  "stroke-linecap=\"round\"  d=\"";
     for(const auto i : s) print_seg(i);
     std::cout << "\"/>";
 
     std::vector<Segment> segs;
-    std::cout << "<path fill=\"none\" stroke=\"blue\" "
+    std::cout << "<path fill=\"none\" stroke=\"blue\" stroke-opacity=\".8\" "
                  "stroke-linecap=\"round\"  d=\"";
     xyhatch(h, s, print_seg);
     std::cout << "\"/>";