0.32 SPIRODELA POLYRRHIZA (L 3-6
 0.34 LEMNA MINOR L.          1-6
 0.36 LEMNA TRISULCA L.       1-6
 0.38 LEMNA MINOR L.          3-6
 0.39 HYDROCHARIS MORSUS-RANA 1-6
 0.46 HYDROCHARIS MORSUS-RANA 4-6
 0.46 LEMNA TRISULCA L.       4-6
 0.49 LEMNA GIBBA L.          1-6
   0.51 SALVINIA NATANS (L.) AL 1-6
 0.51 AZOLLA FILICULOIDES LAM 1-6
 0.53 CERATOPHYLLUM DEMERSUM  1-6
   0.55 WOLFFIA ARRHIZA (L.) WI 1-6
 0.55 HELODEA CANADENSIS RICH 1-6
 0.55 SAGITTARIA SAGITTIFOLIA 1-6
 0.57 NUPHAR LUTEUM SM.       1-6
   0.57 POTAMOGETON COMPRESSUS  1-3
 0.58 HOTTONIA PALUSTRIS L.   1-6
 0.58 POTAMOGETON NATANS L.   1-6
 0.59 MYRIOPHYLLUM VERTICILLA 1-6
 0.59 HOTTONIA PALUSTRIS L.   3-6
 0.60 UTRICULARIA VULGARIS L. 1-6
 0.60 CALLITRICHE OBTUSANGULA 1-6
 0.60 POTAMOGETON CRISPUS L.  1-6
 0.60 HELODEA CANADENSIS RICH 4-6
 0.60 POTAMOGETON LUCENS L.   1-6
 0.61 CERATOPHYLLUM DEMERSUM  5-6
 0.61 HIPPURIS VULGARIS L.    1-6
 0.61 MYRIOPHYLLUM SPICATUM L 1-6
 0.61 RANUNCULUS CIRCINATUS S 1-6
 0.61 SPARGANIUM SIMPLEX HUDS 1-6