pro plot_tai_diff,hk,diff=diff,sctai=sctai,lstai=lstai
;
;  plots the difference between S/C TAI and the LASCO local TAI
;
; @(#)plot_tai_diff.pro	1.1 01/23/98 :LASCO IDL LIBRARY
;
hk1 = gethkn(hk,1)
obt = getlobt(hk1)
sctai = obt2tai(hk1(6:11,*))
lstai = obt2tai(obt)
diff = sctai-lstai
utc = tai2utc(sctai)
utplot,utc,diff,/yno,title='S/C OBT - LASCO HK LOBT',ytitle='Seconds'
return
end