Time selection

Time selection expression is a comma separated list of time specifications. Time can be specified in the format YYYY/MM/DD/HH:MM:SS.FF. Fields (i.e., YYYY, MM, DD, HH, MM, SS and FF), starting from left to right, can be omitted. Omitted fields will be replaced by context sensitive defaults as explained below.

T0, T1 and dT in the following description are time specifications.

Syntax

• time =  T0$\sim$ T1

  Selects all time stamps starting from T0 to T1. Fields missing in T0 are replaced by the fields in the time stamp of the first valid selected row in the MS. Fields missing in T1 are replaced by the corresponding fields of T0 (after its defaults are set).

• time =  T0

  Selects all time stamps that are within an integration time of T0. Integration time is determined from the first valid selected row (more rigorously, an average integration time should be computed). Default settings for the missing fields of T0 are as described in bullet (1) above.

• time =  T0+dT

  Selects all time stamps starting from T0 and ending with time value given by T0+dT. Defaults of T0 are set as usual described in bullet (1) above. Defaults for dT are set from the time corresponding to MJD=0. I.e. dT is an specification of length of time from nominal "start of time" (the time stamp of the first valid selected row of the MS).

• time =  $>$ T0

  Selects all times greater than T0.

• time =  $<$ T0

  Selects all times less than T0. Default settings for T0 are as above.