analysis/webservice/algorithms/Tomogram.py [670:709]:
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        data_in_bounds = self.do_subset(dataset, parameter, slices, 0)
        z_step = TomogramBaseClass._get_elevation_step_size(data_in_bounds)

        r = np.arange(min_elevation, max_elevation + z_step, z_step)

        logger.info(f'Fetched {len(data_in_bounds):,} data points at this elevation')

        ds = TomogramBaseClass.data_subset_to_ds_with_elevation(
            TomogramBaseClass.bin_subset_elevations_to_range(data_in_bounds, r, z_step / 2)
        )[3]

        slices['elevation'] = slice(None, None)
        elev_vars = {}

        if len(ch_ds) > 0:
            elev_vars['ch'] = TomogramBaseClass.data_subset_to_ds(
                self.do_subset(ch_ds[0], parameter, slices, 0)
            )[3]
            elev_vars['ch'].attrs['_source'] = ch_ds[0]

            if len(ch_ds) == 2:
                elev_vars['ch_secondary'] = TomogramBaseClass.data_subset_to_ds(
                    self.do_subset(ch_ds[1], parameter, slices, 0)
                )[3]
                elev_vars['ch_secondary'].attrs['_source'] = ch_ds[1]

        if len(g_ds) > 0:
            elev_vars['gh'] = TomogramBaseClass.data_subset_to_ds(
                self.do_subset(g_ds[0], parameter, slices, 0)
            )[3]
            elev_vars['gh'].attrs['_source'] = g_ds[0]

            if len(g_ds) == 2:
                elev_vars['gh_secondary'] = TomogramBaseClass.data_subset_to_ds(
                    self.do_subset(g_ds[1], parameter, slices, 0)
                )[3]
                elev_vars['gh_secondary'].attrs['_source'] = g_ds[1]

        if elev_vars:
            TomogramBaseClass.add_variables_to_tomo(ds, **elev_vars)
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analysis/webservice/algorithms/Tomogram.py [1013:1052]:
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        data_in_bounds = self.do_subset(dataset, parameter, slices, 0)
        z_step = TomogramBaseClass._get_elevation_step_size(data_in_bounds)

        r = np.arange(min_elevation, max_elevation + z_step, z_step)

        logger.info(f'Fetched {len(data_in_bounds):,} data points at this elevation')

        ds = TomogramBaseClass.data_subset_to_ds_with_elevation(
            TomogramBaseClass.bin_subset_elevations_to_range(data_in_bounds, r, z_step / 2)
        )[3]

        slices['elevation'] = slice(None, None)
        elev_vars = {}

        if len(ch_ds) > 0:
            elev_vars['ch'] = TomogramBaseClass.data_subset_to_ds(
                self.do_subset(ch_ds[0], parameter, slices, 0)
            )[3]
            elev_vars['ch'].attrs['_source'] = ch_ds[0]

            if len(ch_ds) == 2:
                elev_vars['ch_secondary'] = TomogramBaseClass.data_subset_to_ds(
                    self.do_subset(ch_ds[1], parameter, slices, 0)
                )[3]
                elev_vars['ch_secondary'].attrs['_source'] = ch_ds[1]

        if len(g_ds) > 0:
            elev_vars['gh'] = TomogramBaseClass.data_subset_to_ds(
                self.do_subset(g_ds[0], parameter, slices, 0)
            )[3]
            elev_vars['gh'].attrs['_source'] = g_ds[0]

            if len(g_ds) == 2:
                elev_vars['gh_secondary'] = TomogramBaseClass.data_subset_to_ds(
                    self.do_subset(g_ds[1], parameter, slices, 0)
                )[3]
                elev_vars['gh_secondary'].attrs['_source'] = g_ds[1]

        if elev_vars:
            TomogramBaseClass.add_variables_to_tomo(ds, **elev_vars)
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