You can also run lua (which is a scripting language) from the console. 'tpt' is a table. 'tpt.el' is a table inside this table. You can also run if/elseif/else, for, while, and about anything else in lua! The table tpt.el has the properties of elements (such as Advection, Drag, etc.) in it. To view the contents of this table, type
for k,_ in pairs(tpt.el) do print(k) end