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The old random number generators have been removed from Cloudy. These were based on the Mersenne twister algorithm and the Box-Muller method for generating random numbers with a normal (Gaussian) distribution. The new code uses a fully vectorized version of [xoshiro256\*\*](http://xoroshiro.di.unimi.it/), while the random numbers with a normal distribution are now generated using the [Ziggurat](https://www.jstatsoft.org/article/view/v005i08) algorithm. Both methods are much faster than the old ones. An additional advantage is that the new code is fully aware of parallellization in the code, meaning that parallel ranks created with MPI or fork will automatically have a different sequence of random numbers. The code now generates a random seed at the start of execution by default (usually derived from /dev/urandom), unless the `-s` command line parameter described above is used.
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three new SEDs are also added to the new version:
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* The **obscured SED of NGC 5548**: This SED (called *NGC5548obscured.sed*) is taken from [Mehdipour et al. 2015](http://adsabs.harvard.edu/abs/2015A%26A...575A..22M) and shows how the X-ray regions of the intrinsic SED are dramatically absorbed by the obscurer.
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*the **Unobscured SED of Mrk 817**: This SED ()is resulted from early observations of the AGN performed in 2020 by the STORM2 group [Kara et al. 2021](https://ui.adsabs.harvard.edu/abs/2021ApJ...922..151K/abstract).
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Three new SEDs are also added to the latest version:
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* The **obscured SED of NGC 5548**: This SED (called *NGC5548obscured.sed*) is taken from [Mehdipour et al. 2015](http://adsabs.harvard.edu/abs/2015A%26A...575A..22M) and shows how the obscurer dramatically absorbs the X-ray regions of the intrinsic SED.
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*The **unobscured SED of Mrk 817**: This SED (called *Mrk817.sed*)has resulted from early observations of the AGN performed in 2020 by the STORM2 group [Kara et al. 2021](https://ui.adsabs.harvard.edu/abs/2021ApJ...922..151K/abstract).
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The **obscured SED of Mrk817**: This SED (called *Mrk817obscured.sed*) has resulted from a different visit of the AGN performed by the STORM2 group [Kara et al. 2021](https://ui.adsabs.harvard.edu/abs/2021ApJ...922..151K/abstract). Both of the SEDs of the Mrk817 are shown in figure 8 of Kara et al. 2021. Please note that as of today (January 2022), the observations of Mrk 817 are still going on. Based on the results from the campaign, there is a possibility that we will add more versions of the Mrk 817 SEDs to Cloudy. In that case, please refer to the explanations added to the end of each SED file available in cloudy/data/SED for detailed explanations.
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## Other changes
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