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The function returns the irradiance profile along the middle (interior)\nrow by default, but user interface options include `'first'`, `'interior'`,\n`'last'`, and `'single'`. Single-axis tracking is supported, and hourly output\nfiles based on TMY inputs are saved. Spatial nonuniformity is reported, with\nmultiple rear-facing irradiances collected on the back of each module row.\n\nBilinear interpolation code add-on to bifacialvf (description below) to pre-generate IV arrays and bifacial coefficients, and to examine the energy production with back side irradiance mismatch for either a portrait or landscape module.   \nIncluded are IV curves and bifacial info for a Yingli (standard) module. \n\n## Pre-requisites\nThis software is written for Python 2 or 3. NREL recommends [Anaconda Python](https://www.anaconda.com/download/).\n\n## Install using pip\n[bifacialvf](https://pypi.org/project/bifacialvf/) is at the Python Package Index (PyPI). Use pip to install the latest release in your conda environment or virtualenv:\n\n    (myenv)$ pip install bifacialvf\n\n### Install development mode from GitHub\nFor those interested in contributing to bifacialvf:\n\n1. Clone the bifacialvf repository: `$ git clone https://github.com/NREL/bifacialvf.git bifacialvf-main`\n2. Navigate to the repository directory where `setup.py` is located: `$ cd bifacialvf-main`\n3. Install via pip in development mode: `$ pip install -e .`\n\n## Usage\n\nFor usage examples, see the Jupyter notebooks in \\docs\\\n\n## License\nbifacialvf open source code is copyrighted by the Alliance for Sustainable Energy and licensed with BSD-3-Clause terms, found here.\n\n## Citing bifacialVF\n\nIf you use bifacial_radiance in a published work, please cite:\n\n    Marion, B., MacAlpine, S., Deline, C., Asgharzadeh, A., Toor, F., Riley, D., … Hansen, C. (2017). A Practical Irradiance Model for Bifacial PV Modules: Preprint. In 44th IEEE Photovoltaic Specialists Conference. Washington, DC. https://www.nrel.gov/docs/fy17osti/67847.pdf. NREL/CP-5J00-67847\n\nPlease also cite the DOI corresponding to the specific version of bifacialVF that you used. bifacialvf DOIs are listed at [Zenodo.org](https://zenodo.org/search?page=1\u0026size=20\u0026q=conceptrecid:6369162\u0026all_versions\u0026sort=-version). \n\n    Silvana Ovaitt, Chris Deline, Mark Mikofski, \u0026 Nick DiOrio. (2022). NREL/bifacialvf: v0.1.8 Release (v0.1.8). Zenodo. https://doi.org/10.5281/zenodo.6369162\n\nBilinear Interpolation based on the publications:\n\n    De Soto, W., Klein, S. A., \u0026 Beckman, W. A. (2006). Improvement and validation of a model for photovoltaic array performance. Solar Energy, 80(1), 78–88. https://doi.org/10.1016/j.solener.2005.06.010\n\n    Marion, B., Rummel, S., \u0026 Anderberg, A. (2004). Current--voltage curve translation by bilinear interpolation. 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