'*' This indicates that segregation among different Class 1 materials is governed by the compatibility table in 49CFR 177.848(f)
'X' These materials may not be loaded, transported, or stored together in the same transport vehicle or storage facility during the course of transportation.
'O' Indicates that these materials may not be loaded, transported or stored together in the same transport vehicle or storage facility during the course of transportation, unless separated in a manner that, in the event of leakage from packages under conditions normally incident to transportation, commingling of hazardous materials would not occur.
'A' This note means that, notwithstanding the requirements of the letter 'X', ammonium nitrate fertilizer may be loaded or stored with Division 1.1 or Division 1.5 materials.
The absence of any hazard class or division or a blank space in the table indicates that no restrictions apply.