The hot/warm pixels maps are distributed with SolarSoft under hinode/eis/data/cal branch.

Before EIS launch, the CCD read-out section was assumed in the middle 512 rows of the CCD. That means EIS_PREP only needs hot/warm pixels maps of middle section of CCDs.

However, in post-launch phase, the top and bottom of the CCDs were introduced to cover whole CCDs area (ie. Y-axis: 0-1023 rows, X-axis: 0-4095 columns). Thus hot/warm pixels maps for EIS CCDs have been generated accordingly as top and bottom maps (in detail: REGCAL072 study for top of CCDs and REGCAL071 study for bottom). The EIS_PREP routine has also changed in order to use top and bottom hot/warm pixels maps.

The EIS camera electronics do not readout CCD row 0 in the y-direction (this is due to how the electronics work, row 0 is always discarded), so for the bottom of the CCDs EIS camera readout from row 1 to row 512 (inclusive), and for the top the camera readout from row 512 to row 1023 (inclusive).

So we can see there is an overlap at the 512th row, ie.:

"The overlapping row (512) is there because the MDP requires that data to be a multiple of 8 in both the X and Y directions. Rows 1 to 511 is not a multiple of 8, hence we have to read rows 1 to 512 (inclusive). For the top half we must read 512 for 512 (i.e. rows 512 to 1023), hence the overlap in row 512."

-- Jian Sun (2008-10-17)

The middle 512 rows of the CCDs were used at the beginning of the mission until January 2008 when the change was made to read-out the full CCD height (1024 rows). The hot and warm pixel maps are for the middle 512 rows until 18th January 2008. From the 19th January 2008 onwards the hot and warm pixel maps are for the full CCD height (split into the top 512 rows and bottom 512 rows).

--LouisaBradley, 13-Aug-2009