A method for making directional resistivity measurements includes sequentially transmitting first and second axial and transverse electromagnetic waves in a borehole and receiving substantially pure axial and transverse components of each of the transmitted waves. In one aspect, a method includes analyzing a layout diagram of a distribution center. In an alternative embodiment, andrographalide was delivered via a pump with similar results. If files are attached to an incoming email, the change service identifies whether the files are tagged in a manner unique to the compare service.