我想把三张红外谱图合并在一张图中， 有两个红外谱图是.csv格式的，很容易就导入到origin中，可是有一张是.dpt格式的，如何把dpt格式的文件导入到origin呢？谢谢大家了！数据如下：
3999.65721,0.99993
3997.72873,0.99974
3995.80026,0.99955
3993.87178,0.99939
3991.94331,0.99937
3990.01483,0.99948
3988.08636,0.99968
3986.15788,0.99989
3984.22941,1.00000
3982.30093,1.00002
3980.37246,1.00000
3978.44398,0.99993
3976.51551,0.99978
3974.58703,0.99957
3972.65856,0.99938
3970.73008,0.99918
3968.80161,0.99890
3966.87313,0.99862
3964.94466,0.99844
3963.01618,0.99843
3961.08771,0.99853
3959.15923,0.99863
3957.23076,0.99869
3955.30228,0.99867
3953.37381,0.99858
3951.44533,0.99842
3949.51686,0.99824
3947.58838,0.99795
3945.65991,0.99755
3943.73143,0.99718
3941.80296,0.99699
3939.87448,0.99703
3937.94601,0.99722
3936.01753,0.99752
3934.08906,0.99785
3932.16058,0.99814
3930.23211,0.99832
3928.30363,0.99840
3926.37516,0.99840
3924.44668,0.99829
3922.51821,0.99814
3920.58973,0.99808
3918.66126,0.99811
3916.73278,0.99812
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