== P3.0	Large spatial scale instrument and telescope flat field == 

- **Phase**		:	3  
- **Status**		: 	Draft	 
- **Category**	: 	Nighttime testing (functionality and operability) (C5) + Nighttime calibration (C6)
- **Recurrence**	: 	before every night observations (valid for all observing modes). 2/day for CI (BB filter only).
- **Duration**	: 	2 hours

**Description**
- Flat field is taken during twilight 

**Prerequisites**
- Authorize SHARK-NIR on the SX side.
- Atmospheric conditions: AO working conditions.
- Bad pixel map, Background, or Dark. 

**Procedure**
- This calibration is performed by sky observation combined with a pointing scan to record a flat (including telescope large scale transmission variations) on the detector. 
- Single integration times for a given setup, using various flux levels with natural light with no coronagraph.

**Templates**

**Success criteria**
- Width of flux distribution: 3.10-2  

**Notes**
- Same as activity 7.5 in AD4

**LBTO support**
- Dome open during twilight

**Date performed and by whom**