Modification in the CFH12K Focal Plane - May 25, 2000
			(New Output Geometry)

To improve noise characteristics of CCD03, the output B (right) is
now being used. The following table provides an update on the
mosaic performance.

Mosaic geometry
---------------

Hi Rho parts = HZ

 B---------- B---------  B---------  B---------  B---------  B---------  
|           |           |           |           |           |           |
|   CCD06   |   CCD07   |   CCD08   |   CCD09   |   CCD10   |   CCD11   |
|           |           |           |           |           |           |
------------------------------------------------------------------------  East
|           |           |           |           |           |           |
|   CCD00   |   CCD01   |   CCD02   |   CCD03   |   CCD04   |   CCD05   |
|           |           |           |     HZ    |     HZ    |     HZ    |
 A---------  A---------  ----------B  ---------B A---------  A---------  
                                North

Gain/noise
----------
The CCDs are linear within 1% over the indicated dynamic (less than 65K
for those whose full well is reached before the digital saturation).
The pixel time is 7 microseconds (145 Kpixels per second per channel, to
be multiplied by 12 for the global data flow, say 1.8Mpixels per second).

Gain (e-/ADU):          1.8     1.7     1.4     1.5     1.8     1.5
                        1.5     1.5     1.6     1.5     1.3     1.7

Noise (e-):             5.0     5.1     3.4     3.9     3.4	5.2
                        4.2     3.0     5.4     5.1    10.5     3.4

Noise (ADU):            2.8     3.0     2.4     2.6     2.2     3.5
                        2.8     2.0     3.4     3.4     8.1     2.0

Linearity range (ADU):  52000	53000	65000	54000	51000	65000
			62000	65000	51000	65000	60000	65000