84 Mpc.

\[table:general\]

Observations {#sect:obs}
============

[*Spitzer*]{} data {#sect:irs}
------------------

Haro11 was observed with the Infrared Spectrograph [IRS; @houck-2004] on board the [*Spitzer*]{} Space Telescope [@werner-2004], on the 17th of July 2004 (P.I.: J. R. Houck). The 4 modules were used, i.e., the 2 high-resolution modules: Short-High SH ($\approx10-20~\mu$m) and Long-High LH ($\approx19-37~\mu$m) with $R\sim600$, and the 2 low-resolution modules: Short-Low SL ($\approx5-14~\mu$m) and Long-Low LL ($\approx14-37~\mu$m) with $R\sim60-120$. Observations were done in staring mode (AORKey 9007104). Figure \[fig:aors\] shows the slits of the high-resolution module on the sky.

![H$\alpha$ image of Haro11 from the Hubble Legacy Archive. The [*Spitzer*]{}/IRS high-resolution slits are overlaid in green and the [*Herschel*]{}/PACS array in red. The PACS beamsize at 150 $\mu$m is 11.5$^{\prime\prime}$. The IRS low-resolution slits are not shown. []{data-label="fig:aors"}](19818f02){width="8.8cm"}

The low-resolution spectra were retrieved from the CASSIS Atlas[^2] [@lebouteiller-2011], with a tapered spatial window that scales with wavelength to account for the broader PSF at longer wavelengths. The high-resolution spectra were obtained with SMART v8.2.2 [@lebouteiller-2010; @higdon-2004] from the full-slit extraction of SH and LH and assuming a point-like source calibration. The SL and SH spectra were stitched to LL and LH by applying the same factor $1.13$, which is due 