Eagle resistor clarification

I found this on

http://www.instructables.com/id/ENUTEALRUXEQHO8Y6O/

The general purpose fixed resistor devices are called either R-US (if you like the US zigzag line type
of schematics symbol) or R-EU (if you prefer the European simple rectangle.] The package options
are numerous, but make sense after you realize that there's a common format: "WWLL/SS" where WW is the body width, LL is the body length, and SS is the hole spacing, all in truncated millimeters. A typical 1/4W
resistor measures about 2.5mm in diameter and 7mm long; hole spacing depends on how you bend the
leads. So R-US_0207/10 is a 1/4W resistor with 10mm (actually 4*2.54, or 10.16mm, since we want to
stay close to a 0.1 inch (2.54mm) grid.) R-US_0207/2V is the same resistor mounted vertically with 2.54mm lead spacing. 1/8W resistors are similarly designated "R-US_0204/SS"

As I'm learning EAGLE