The data:
    Sequence {
        String sta;
        String event;
        String diatom_Nit_bi;
    } Level_0;
 = { { 5, 11031315, 21.0 }, { 8, 11032135, 67.8 }, { 11, 11041345, 43.3 }, { 17, 11071306, 66.8 }, { 22, 11080700, 63.5 }, { 25, 11082125, 68.2 }, { 28, 11091230, 54.2 }, { 30, 11100107, 63.5 }, { 33, 11101455, 61.2 }, { 37, 11110740, 50.7 }, { 42, 11120301, 53.7 }, { 51, 11150953, 64.4 }, { 54, 11160237, 38.8 }};