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# Understand the tests performed
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Each datastream describes the tests performed on the data values in the netCDF header, including the description of the bit number correlating to the test. The first step in using the companion QC field is to choose which tests to use for masking the data.
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For example, the direct normal broadband companion quality control has [six tests performed on the data](https://github.com/ARM-tools/QC-flag-examples/wiki/direct-normal-broadband). Each bit is described with a description attribute (i.e. qc_direct_normal_broadband:bit_1_description) describing the test associated with each bit. If a value meets the test criteria, that bit will be set.
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For example, the direct normal broadband companion quality control has [six tests performed on the data](direct-normal-broadband). Each bit is described with a description attribute (i.e. qc_direct_normal_broadband:bit_1_description) describing the test associated with each bit. If a value meets the test criteria, that bit will be set.
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To use the companion field QC decide which tests are relevant to your analysis and will be used for masking data from analysis.
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Next, choose the example code from the [language you use](https://github.com/ARM-tools/QC-flag-examples/wiki#examples-in-various-languages). |
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Next, choose the example code from the [language you use](wiki#examples-in-various-languages). |
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