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https://img.shields.io/github/actions/workflow/status/planck-npipe/lollipop/testing.yml?branch=master)](https://github.com/planck-npipe/lollipop/actions/workflows/testing.yml)\n[![pypi](https://img.shields.io/pypi/v/planck-2020-lollipop)](https://pypi.python.org/pypi/planck-2020-lollipop)\n[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)\n\n``Lollipop`` is a Planck low-l polarization likelihood based on cross-power-spectra for which the\nbias is zero when the noise is uncorrelated between maps. It uses the approximation presented in\n[Hamimeche \u0026 Lewis (2008)](https://arxiv.org/abs/0801.0554), modified as described in [Mangilli et\nal. (2015)](https://arxiv.org/abs/1503.01347) to apply to cross-power spectra.  This version is\nbased on the Planck PR4 data. Cross-spectra are computed on the CMB maps from Commander component\nseparation applied on each detset-split Planck frequency maps.\n\nIt was previously applied and described in\n- [Planck Collaboration Int. XLVII (2016)](https://arxiv.org/abs/1605.03507) for investigating the\n  reionization history,\n- [Tristram et al. (2021)](https://arxiv.org/abs/2010.01139) Planck constraints on the tensor-to-scalar ratio\n- [Tristram et al. (2022)](https://arxiv.org/abs/2112.07961) Improved limits on the tensor-to-scalar ratio using BICEP and Planck data\n\nIt is interfaced with the ``cobaya`` MCMC sampler.\n\nRequirements\n------------\n* Python \u003e= 3.5\n* `numpy`\n* `astropy`\n\nInstall\n-------\n\nThe easiest way to install the `Lollipop` likelihood is *via* `pip`\n\n```shell\npip install planck-2020-lollipop [--user]\n```\n\nIf you plan to dig into the code, it is better to clone this repository to some location\n\n```shell\ngit clone https://github.com/planck-npipe/lollipop.git /where/to/clone\n```\n\nThen you can install the `Lollipop` likelihoods and its dependencies *via*\n\n```shell\npip install -e /where/to/clone\n```\n\nThe ``-e`` option allow the developer to make changes within the `Lollipop` directory without having\nto reinstall at every changes. 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