WFC3 Data Handbook v.4
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WFC3 Data Handbook > Chapter 2: WFC3 Data Structure > 2.3 Data Storage Requirements

2.3
The sizes of WFC3 data files (in MB) are given in Table 2.7. The following assumptions were made when calculating these sizes:
Table 2.7: Sizes of WFC3 data files.
The size of the drizzled image (_drz) is for a single image that is drizzled only for the purpose of performing geometric corrections and for combining the two UVIS chips. It assumes that the input and output image pixels are approximately the same size (drizzle scale parameter is 1.0).

WFC3 Data Handbook > Chapter 2: WFC3 Data Structure > 2.3 Data Storage Requirements

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