In Table 2.7 and
Table 2.8, we list the WFC3 keywords that appear in the primary header and SCI extension header, respectively. Columns 1 and 2 give the name of the keyword and a short description. The third column gives the format used for the value of the keyword: "L" for boolean values, "C" for characters, "R" for real values and "I" for integer values, followed by the precision of the value. Columns 4 and 5 show to which detector the keyword applies.
Table 2.9 lists the keywords that appear in the headers of the ERR, DQ, SAMP, and TIME extensions belonging to an imset in a WFC3 data file. Note that the SAMP and TIME extensions apply only to IR data.
AstroDrizzle adds additional keywords which are not listed in this handbook, and when it adds extensions does not update the NEXTEND keyword value. Consult the AstroDrizzle Handbook for further information. Users can use the STDAS task
catfits to see all extensions in a file. The pattern keywords refer to the WFC3 dithering patterns available which are discussed in greater detail in
Section 4.2.
