FPO, how bout this one then
SECTION 2. AREA NAVIGATION (RNAV) AND REQUIRED NAVIGATION PERFORMANCE (RNP)
1. RNP Levels. An RNP “level” or “type” is applicable to a selected airspace, route, or procedure. As defined in the Pilot/Controller Glossary, the RNP Level or Type is a value typically expressed as a distance in nautical miles from the intended centerline of a procedure, route, or path. RNP applications also account for potential errors at some multiple of RNP level (e.g., twice the RNP level).
(a) Standard RNP Levels. U.S. standard values supporting typical RNP airspace are as specified in TBL 1-2-1 below. Other RNP levels as identified by ICAO, other states and the FAA may also be used.
TABLE 1-2-1 U.S. Standard RNP Levels

RNP Level
Typical Application
Primary Route Width (NM) - Centerline to Boundary
0.1 to 1.0
RNP SAAAR Approach Segments
0.1 to 1.0
0.3 to 1.0
RNP Approach Segments
0.3 to 1.0
1
Terminal and En Route
1.0
2
En Route
2.0
NOTE:
1. The“performance”ofnavigationinRNPrefersnotonlytothelevelofac curacyofaparticularsensororaircraftnavigation system, but also to the degree of precision with which the aircraft will be flown.
2. Specific required flight procedures may vary for different RNP levels.

(b) Application of Standard RNP Levels. U.S. standard levels of RNP typically used for various routes and procedures supporting RNAV operations may be based on use of a specific nav- igational system or sensor such as GPS, or on multi-sensor RNAV systems having suitable performance.
(c) Depiction of Standard RNP Levels. The applicable RNP level will be depicted on affected charts and procedures.
You can find it in Jeppeen Radio data general p 225. It's official source. You're one stubborn son of gun.
