HMI and IBIS observations of the leading sunspot in NOAA AR 12002. Top: full-disk HMI continuum image (left) at 21:00 UT on 2014 March 13, IBIS Ca II IR line-core image (middle), and speckle-reconstructed IBIS broadband image (right). The square and dashed rectangle in panel a indicate the IBIS and HMI SHARP FOV, respectively. Bottom: field lines derived from the NFFF extrapolation overlaid on a composite image of the vertical component of the magnetic field and the AIA 171 Å image for the SHARP FOV. The solid and dashed white squares correspond to the IBIS FOV and the smaller FOV shown in Fig. 2, respectively.