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offsets for f4
- CCD 2: xoffset = x(slit) – 2140; yoffset = y(slit) – 4170
- CCD 3: xoffset = x(slit) – 10; yoffset = y(slit) – 4170
- CCD 5: xoffset = -90 – x(slit); yoffset = 4110 – y(slit)
- CCD 8: xoffset = 2040 – x(slit); yoffset = 4090 – y(slit)
