Readme for arc_events.tgz

1st panel: S-N keogram of 630.0 nm ASI data. Gray region means "no observation".
2nd panel: Optical intensity of 630.0 nm emission in units of Rayleigh at zenith.
           Gray region means "no observation". Light gray region means "cloudy sky".
           # Vertical dotted lines mark the extracted arcs.
3rd panel: S-N keogram of the 557.7 nm ASI data. Gray region means "no observation".
4th panel: Optical intensity of 557.7 nm emission in units of Rayleigh at zenith.
           Gray region means "no observation". Light gray region means "cloudy sky".
           # Vertical dotted lines mark the extracted arcs.