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Parameters ---------- nx, ny : int The number of samples in each direction. lon_cycle, lat_cycle : 360 or None If not None, values in the corresponding direction are taken modulo *lon_cycle* or *lat_cycle*; in theory this can be any number but the implementation actually assumes that it is 360 (if not None); other values give nonsensical results. This is done by "unwrapping" the transformed grid coordinates so that jumps are less than a half-cycle; then normalizing the span to no more than a full cycle. For example, if values are in the union of the [0, 2] and [358, 360] intervals (typically, angles measured modulo 360), the values in the second interval are normalized to [-2, 0] instead so that the values now cover [-2, 2]. If values are in a range of [5, 1000], this gets normalized to [5, 365]. lon_minmax, lat_minmax : (float, float) or None If not None, the computed bounding box is clipped to the given range in the corresponding direction. 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