Summary of the specification

This section attempts to formally summarise the proceeding discussion, including more specifically allowance for the track joints:

1. The rms pointing errors in elevation should not exceed 0.3 over any 30 interval after inclinometric correction.

2. The rms pointing errors in azimuth should not exceed 0.3 \ over any 30 interval after inclinometric correction for sources between 10 and 85 degrees elevation (i.e. the combined effects of yaw and roll should never exceed 0.3 rms).

3. The rms calculations should include the effect of tracking over any joint. However, since the azimuths of the wheel/joint interactions are well known, it is permissable to assume that pointing corrections will not be made at a wheel/joint location (i.e. the possibility of the zero-point for the rms calculation being significantly in error may be excluded).

4. The peak-peak contribution of the azimuth track to the pointing error in each axis should not exceed 2 after inclinometric correction.

5. the rms value of as defined above should never exceed 20m over any 30 interval after "inclinometric" correction.

6. the peak value of (maximum value of z and x) should never exceed 100m after "inclinometic correction".

The above specifications may be achieved by mechanical improvements to the track, or improvements to the inclinometry system (data acquisition and/or improved modelling of the corrections). We assume that in practice a combination of both will take place. In any event, we add the further requirements:

• the above specifications should be met under all normal observing conditions (i.e. day and night);

• meeting the above specification should not require inclinometry measurements be made more often than once per month, under routine circumstances (i.e. ignoring earthquakes, central bearing adjustments, installation of SCUBA, etc).