name,column1,column2,column3
abc,1.1*,4.2,1.2
def,2.1,1.4,5.2
ghi,1.5,1.2,-2.1*
jkl,1.8,-1.1*,4.2
mno,9.4,6.6,6.2
pqr,1.4,8.3,8.4