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The relative coordinate system is a cartesian frame
( 
)
which projects the equatorial frame
( 
) onto the plane FOV.
The 
-axis is aligned with the nominal pointing direction
(or the centre of the strip during the all-sky survey phase),
the 
-axis parallel to the local meridian
in the direction of increasing 
,
and the 
-axis perpendicular to the local meridian
in the direction of increasing 
(Fig. 2.7).
