Searching Databases

The databases within the archive are accessed via the program BROWSE. This provides a command driven environment which enables the user to select, list, correlate, plot and extract data from the archive. Various display and data analysis packages are also incorporated within BROWSE.

To start BROWSE type

LEDAS> browse

you will then be prompted for a database name. Type ? to get a listing of the databases available. Alternatively, you can simply type

LEDAS> browse [databasename]

if you already know the name of the database.

A full guide to BROWSE is given in ESA TM-11 ``The EXOSAT Database System: Browse User's Guide'', and on-line help is provided when ? or help [command] is entered. Some example commands are listed below.

LEDAS> browse rospublic                 ! Browse rospublic database
ROSPUBLI_TOTAL_DEC > help                   ! Access on-line BROWSE help
ROSPUBLI_TOTAL_DEC > dbhelp                 ! Access on-line database help
ROSPUBLI_TOTAL_DEC > cey 2000               ! Change equinox to J2000
ROSPUBLI_TOTAL_DEC > lpar                   ! List database parameters
ROSPUBLI_TOTAL_DEC > dsam                   ! Display found entries
ROSPUBLI_TOTAL_DEC > dpage                  ! Display catalogue page
ROSPUBLI_TOTAL_DEC > sc                     ! Search by coordinates
ROSPUBLI_TOTAL_DEC > sif instrument pspc    ! Select all entries with
                                            ! parameter instrument = pspc
ROSPUBLI_TOTAL_DEC > sef exposure 0 999     ! Exclude all entries with
                                            ! 0 <= exposure <= 999
ROSPUBLI_TOTAL_DEC > rlf                    ! Remove effect of last filter
ROSPUBLI_TOTAL_DEC > xp                     ! Extract on-line products
ROSPUBLI_TOTAL_DEC > request                ! Request near-line products
ROSPUBLI_TOTAL_DEC > exit                   ! Exit browse