HST Data Handbook for WFPC2

B.1 Rootnames

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Rootnames of HST data files follow the naming convention defined in table B.1, which expands on the previous convention as follows: an initial "N" indicates a NICMOS exposure, an intial "O" indicates a STIS exposure, and the rootnames of files containing association products (see below) end in a number (0-8).

Table B.1: IPPPSSOOT Root File Names

Character	Meaning
I	Instrument used, will be one of: E - Engineering data F - Fine Guidance Sensors N - Near Infrared Camera and Multi-Object Spectrograph O - Space Telescope Imaging Spectrograph S - Engineering subset data T - Guide star position data U - Wide Field/Planetary Camera-2 V - High Speed Photometer W - Wide Field/Planetary Camera X - Faint Object Camera Y - Faint Object Spectrograph Z -Goddard High Resolution Spectrograph
PPP	Program ID; can be any combination of letters or numbers (46,656 combinations possible). There is a unique association between program ID and proposal ID.
SS	Observation set ID; any combination of letters or numbers (1,296 possible combinations).
OO	Observation ID; any combination of letters or numbers (1,296 possible combinations).
T	Source of transmission or association product number M - Merged real time and tape recorded N - Retransmitted merged real time and tape recorded O - Retransmitted real time (letter `O') P - Retransmitted tape recorded R - Real time (not recorded) T - Tape recorded 0 - Primary association product (number zero) 1-8 - NICMOS background association product