技术请求：合并DATASET1与DATASET2数据集文件

以下为合并原始燃料氮氧化物排放数据集（DATASET1）与燃料编码映射数据集（DATASET2）后的完整结果，所有原始数据内容、技术术语、数值及格式均已保留：

燃料类型    氮氧化物排放量    燃料编码
Ethanol    3.741    F5
Ethanol    2.295    F5
Ethanol    1.498    F5
Ethanol    2.881    F5
Ethanol    0.76    F5
Ethanol    3.12    F5
Ethanol    0.638    F5
Ethanol    1.17    F5
Ethanol    2.358    F5
Ethanol    0.606    F5
Ethanol    3.669    F5
Ethanol    1    F5
Ethanol    0.981    F5
Ethanol    1.192    F5
Ethanol    0.926    F5
Ethanol    1.59    F5
Ethanol    1.806    F5
Ethanol    1.962    F5
Ethanol    4.028    F5
Ethanol    3.148    F5
Ethanol    1.836    F5
Ethanol    2.845    F5
Ethanol    1.013    F5
Ethanol    0.414    F5
Ethanol    0.812    F5
Ethanol    0.374    F5
Ethanol    3.623    F5
Ethanol    1.869    F5
Ethanol    2.836    F5
Ethanol    3.567    F5
Ethanol    0.866    F5
Ethanol    1.369    F5
Ethanol    0.542    F5
Ethanol    2.739    F5
Ethanol    1.2    F5
Ethanol    1.719    F5
Ethanol    3.423    F5
Ethanol    1.634    F5
Ethanol    1.021    F5
Ethanol    2.157    F5
Ethanol    3.361    F5
Ethanol    1.39    F5
Ethanol    1.947    F5
Ethanol    0.962    F5
Ethanol    0.571    F5
Ethanol    2.219    F5
Ethanol    1.419    F5
Ethanol    3.519    F5
Ethanol    1.732    F5
Ethanol    3.206    F5
Ethanol    2.471    F5
Ethanol    1.777    F5
Ethanol    2.571    F5
Ethanol    3.952    F5
Ethanol    3.931    F5
Ethanol    1.587    F5
Ethanol    1.397    F5
Ethanol    3.536    F5
Ethanol    2.202    F5
Ethanol    0.756    F5
Indolene    4.818    F3
Indolene    2.849    F3
Indolene    3.275    F3
Indolene    4.691    F3
Indolene    4.255    F3
Indolene    5.064    F3
Indolene    2.118    F3
Indolene    4.602    F3
Indolene    2.286    F3
Indolene    0.97    F3
Indolene    3.965    F3
Indolene    5.344    F3
Indolene    3.834    F3
Ethanol    1.62    F5
Ethanol    3.656    F5
Ethanol    2.964    F5
82rongas    6.021    F1
82rongas    4.467    F1
82rongas    3.046    F1
82rongas    1.596    F1
82rongas    0.835    F1
82rongas    5.498    F1
82rongas    5.47    F1
82rongas    4.084    F1
82rongas    0.716    F1
94%Eth    2.382    F6
94%Eth    1.004    F6
94%Eth    0.623    F6
94%Eth    1.03    F6
94%Eth    2.593    F6
94%Eth    2.699    F6
94%Eth    3.177    F6
94%Eth    1.151    F6
94%Eth    0.474    F6
94%Eth    2.814    F6
94%Eth    3.308    F6
94%Eth    3.031    F6
94%Eth    2.537    F6
94%Eth    2.403    F6
94%Eth    2.412    F6
Gasohol    -    F4
Methanol    -    F2

内容的提问来源于stack exchange，提问作者Rafayel Voskanyan