anchor.diff:                th Quantity
                 th Units
             tbody
  +            tr
  +              td: var A
  +              td Aspect Ratio
  +              td
               tr
                 td: var C#[sub D]
                 td Drag coefficient
  
positive.code:               td Relative density
                td
  
  
  
        include ../inc/aerodynamic-terms.jade
  
negative.code: 
        section
          h1#definitions Definitions
          h2#quantities Quantities
          table.c-quantity-table
            thead
              tr
  