The bundles are located at the calibration position using the SP mechanism (ISPFC [sb1,sb2,sb3] [cal] [1,2,white]).
CuAr, CuNe and a tungsten lamps are housed in the calibration unit. The two arc lamps can be switched on simultaneously. Typical exposure times with the R1200B/R gratings are a few seconds.
Arc maps obtained with INTEGRAL are shown in INT-IAC-TRP011.