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SPIFFI is an AO-fed integral field spectrograph operating as part of SINFONIon the VLT, which will be upgraded and reused as SPIFFIER in the new VLTinstrument ERIS. In January 2016, we used new technology developments toperform an early upgrade to optical subsystems in the SPIFFI instrument soongoing scientific programs can make use of enhanced performance before ERISarrives in 2020. We report on the upgraded components and the performance ofSPIFFI after the upgrade, including gains in throughput and spatial andspectral resolution. We show results from re-commissioning, highlighting thepotential for scientific programs to use the capabilities of the upgradedSPIFFI. Finally, we discuss the additional upgrades for SPIFFIER which will beimplemented before it is integrated into ERIS.

Making SPIFFI SPIFFIER: Upgrade of the SPIFFI instrument for use in ERIS and performance analysis from re-commissioning