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diff --git a/Documentation/figures/B_b3_y.pov b/Documentation/figures/B_b3_y.pov
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+++ b/Documentation/figures/B_b3_y.pov
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+#include "colors.inc"    // The include files contain
+#include "textures.inc"  // pre-defined scene elements
+#include "glass.inc"
+#include "metals.inc"
+#include "skies.inc"
+#include "shapes.inc"
+#include "arrows.inc"
+#include "bravais.inc"
+
+#declare camera_location = 2 * (x);
+#declare camera_look_at = <0,0,0>;
+
+background { color Cyan }
+
+// all setup
+camera {
+  location camera_location
+  look_at camera_look_at
+}
+
+light_source {
+	<10, 0, 0> 
+	color White
+        parallel
+        point_at <0, 0, 0>
+        shadowless
+}
+light_source {
+	<0, 10, 0> 
+	color White
+        parallel
+        point_at <0, 0, 0>
+        shadowless
+}
+light_source {
+	<0, 0, 10> 
+	color White
+        parallel
+        point_at <0, 0, 0>
+        shadowless
+}
+
+plane { <1,0,0>, -.5 pigment {color LightWood} }
+plane { <0,1,0>, -.5 pigment {color LightWood*.9} }
+plane { <0,0,1>, -.5 pigment {color LightWood*.8} }
+
+#declare b1 = <1,0,0>;
+#declare b2 = <.31,.95,0>;
+#declare b3 = <.4,.5,0.76>;
+
+#declare a1 = vcross(b2,b3);
+#declare a2 = vcross(b3,b1);
+#declare a3 = vcross(b1,b2);
+
+//repere orthonorme
+arrow(y,Gray)
+arrow(z,Gray)
+
+// espace reciproque
+arrow(b1,Blue)
+arrow(b2,Red)
+arrow(b3,Green)
+
+//espce reel
+arrow(a1, Cyan)
+arrow(a2, Magenta)
+arrow(a3, Yellow)
+
+
+plane { b1, 0 pigment {color Blue transmit .7}}
+plane { b2, 0 pigment {color Red transmit .4}}
+plane { b3, 0 pigment {color Green transmit .7}}