数字时间信息列，从序列的开始进行量化得到的。

A timestamp, quantized from the start of the sequence.

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last样式应该应用于任何序列的最后一列。

The last style should be amended to the final column in any series.

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对于第1列，计算后的位置是seed序列的索引；对于其他列，计算后的位置是正确的元素的位置。

For column 1, the calculated position is the index into the sequence of seeds; for the other columns, the calculated position is the position of the appropriate element.

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