7. Accumulating photon lists

Accumulation of a photon list is similar to other accumulations but produces an event list in mission-independent format which can be later the starting point of other cross-accumulations or subject to manipulations

As prerequisites one shall ensure that

FOT tape data have been filed to disk
setting of the appropriate environment variables is complete
a valid observation chain has been defined.

A photon list can contain a subset of the quantities present for each of the original events. Moreover events can also be selected by their value being in a given range.
There are a few ways of controlling the behaviour of the accumulation program.

accumulating a photon list (normal form)
the simplest form of issuing the command is
```
accumulate photon [ pfile {packet} {include include ...} {range range ...}
```
accumulating a photon list (short form)
in the case one wishes to accumulate many photon lists, one can default the kind of accumulation setting the context to photon, after which one can issue an arbitrary number of accumulation commands in the short form (if one wishes to interleave with another kind of accumulation it is sufficient to use the the normal form
```
xasset context p[hoton]
accumulate pfile [{packet} {include include ...} {range range ...}
```
There is no way nor sense in specifiying a quantity or to use the pseudo accumulation mode for photon lists, the environment variables xquantity, yquantity or accummode have no effect.

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sax.iasf-milano.inaf.it/Xashelp/paccum.html :: original creation 2002 Sep 04 17:43:25 CEST :: last edit 2002 Sep 04 17:43:25 CEST

7. Accumulating photon lists

accumulating a photon list (normal form)

accumulating a photon list (short form)

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