Tweaked text and parameters.

Patterns/KardarParisiZhang1986/drainage_erosion.vti

@@ -2,17 +2,17 @@
 <VTKFile type="ImageData" version="0.1" byte_order="LittleEndian" header_type="UInt32" compressor="vtkZLibDataCompressor">
   <RD format_version="6">
     <description>
-      Erosion weighted by the drainage area, by simulating runoff. This method is discussed here: &lt;a href=&quot;https://hal.science/hal-04049125v1/document&quot;&gt;https://hal.science/hal-04049125v1/document&lt;/a&gt;
-
-      See &lt;a href=&quot;open:Patterns/KardarParisiZhang1986/erosion.vti&quot;&gt;erosion.vti&lt;/a&gt; for a simpler implementation of erosion.
+      Erosion weighted by the drainage area. This method is discussed here: &lt;a href=&quot;https://hal.science/hal-04049125v1/document&quot;&gt;https://hal.science/hal-04049125v1/document&lt;/a&gt;
 
       Channel a is the height of the surface.
 
-      Channel b is the estimate of the drainage area (the area of the watershed) of each point.
+      Channel b is the estimate of the drainage area (the area of the watershed) of each point. It is found by simulating the flow of surface water.
 
-      Channel c is the uplift pattern.
+      Channel c is the uplift pattern, added to keep things in an approximate steady-state.
 
       Channel d is a noise image used to add randomness to the result.
+
+      See &lt;a href=&quot;open:Patterns/KardarParisiZhang1986/erosion.vti&quot;&gt;erosion.vti&lt;/a&gt; for a simpler implementation of erosion.
     </description>
     <rule name="drainage" type="kernel" neighborhood_type="vertex">
       <kernel number_of_chemicals="4" block_size_x="1" block_size_y="1" block_size_z="1">

Patterns/KardarParisiZhang1986/uniform_snowfall.vti

@@ -2,9 +2,9 @@
 <VTKFile type="ImageData" version="0.1" byte_order="LittleEndian" header_type="UInt32" compressor="vtkZLibDataCompressor">
   <RD format_version="6">
     <description>
-      The &lt;a href=&quot;https://en.wikipedia.org/wiki/Kardar%E2%80%93Parisi%E2%80%93Zhang_equation&quot;&gt;KPZ equation&lt;/a&gt;:
+      The &lt;a href=&quot;https://en.wikipedia.org/wiki/Kardar%E2%80%93Parisi%E2%80%93Zhang_equation&quot;&gt;KPZ equation&lt;/a&gt; is:
 
-      da/dt = laplacian_a + gradient_mag_a
+      da/dt = laplacian_a + gradient_mag_squared_a
 
       The height increases in areas of higher gradient, producing
       rounded mounds. This is a simple model of surface deposition, such as uniform snowfall.
@@ -52,7 +52,7 @@
       <show_multiple_chemicals value="true"/>
       <active_chemical value="a"/>
       <low value="0.4"/>
-      <high value="2"/>
+      <high value="1.7"/>
       <vertical_scale_1D value="30"/>
       <vertical_scale_2D value="150"/>
       <contour_level value="0.25"/>