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[[File:Shuttle avionics meds pfd orbit.jpg|thumb|The center portion of the ADI ball consists of the line grid which is generated by projecting a pattern of meridians and coordinate circles on a sphere into 2d space and then clipping the central portion out of it.<ref>{{cite web | [[File:Shuttle avionics meds pfd orbit.jpg|left|thumb|The center portion of the ADI ball consists of the line grid which is generated by projecting a pattern of meridians and coordinate circles on a sphere into 2d space and then clipping the central portion out of it.<ref>{{cite web | ||
|url = https://forum.flightgear.org/viewtopic.php?p=297665#p297665 | |url = https://forum.flightgear.org/viewtopic.php?p=297665#p297665 | ||
|title = <nowiki> Re: Nasal must go </nowiki> | |title = <nowiki> Re: Nasal must go </nowiki> |