4.1.1.5    Perform imaging spectroscopy of solar flares with 2.3      arcsec spatial resolution, extending down to soft X-ray      (3 keV) energies.    4.1.1.6    Perform imaging spectroscopy of hard X-ray micro flares      with high sensitivity down to low energies (3 keV).    4.1.1.7    Image hard X-rays of the Crab Nebula with 2.3 arcsec resolution.    4.1.1.8    Obtain high spectral resolution observations of transient hard      X-ray and gammaray sources, including accreting black holes,      cosmic gamma-ray bursts, and terrestrial bursts from trapped      energetic electron precipitation, aurora, and lightning.    4.1.1.9    Perform imaging spectroscopy (> 3 keV) of high temperature      components of solar active regions.    4.1.1.10    Search for polarization of > 20 keV X-rays in solar flares.    4.1.1.11    Perform spectroscopy of steady cosmic hard X-ray and      gamma-ray sources using Earth occultation methods.