================================================================================
        This package uses boolean switches to control many functions

        v3.0 defines the following switches
================================================================================
        
;
;  initialize boolean switches  --  CAPITAL letters are procedure names that
;                                   toggle the state of these switches
;
defsysv, '!LINE', 1        ; spectral LINE mode on  LINE=1 CONT=0
;
defsysv, '!chan', 1        ; default x-axis CHAN   <== these 5 choices are
defsysv, '!freq', 0        ; x-axis FREQ           <== mutually exclusive
defsysv, '!velo', 0        ; x-axis VELOcity       <== choose via: 
defsysv, '!azxx', 0        ; x-axis AZimuth        <==        VELO, CHAN, FREQ,
defsysv, '!elxx', 0        ; x-axis ELevation      <==        AZXX, ELXX, 
defsysv, '!raxx', 0        ; x-axis RA             <==        RAXX, DECX
defsysv, '!decx', 0        ; x-axis DEC            <==        
;
defsysv, '!cursor', 1      ; default cursor on CURON/CUROFF
defsysv, '!zline', 0       ; default zero line off  ZLON/ZLOFF
defsysv, '!dcsub', 0       ; default DC level subtract off DCON/DCOFF   
defsysv, '!srcvl', 0       ; default source velocity flag off SRCVLON/SRCVLOFF
defsysv, '!plthdr', 1      ; default plot header  
defsysv, '!bmark', 1       ; default plot nregions NRON/NROFF
defsysv, '!flag',   0      ; default flag off; used in ccc.pro + else FLAGON/FLAGOFF
defsysv, '!verbose', 0     ; default flag off; toggles procedure debug prints 
defsysv, '!protectns', 1   ; default flag on; protects NSAVE overwrites NSON/NSOFF
defsysv, '!deja_vu',   1   ; default flag on; toggles writes in various procedures
defsysv, '!ONLINE',    1   ; default ONLINE flag; toggles ON/OFFLINE data search
;                                    vis ONLINE=1 or OFFLINE=0 commands
;
        For example, CURON and CUROFF toggle the state of the cursor
        so that commands such as SETX can set the x-axis range for
        plot display either using a screen cursor or a command line
        SETX,begin_channel,end_channel syntax.  Command line syntax
        is most useful for automating data analysis in batch mode type
        procedures