On your original datatable, stack your various X columns together in order to have only one column for X values.
Script for your datatable : Data Table( "XXXXX_ROW1_IV-1" ) << Stack(
columns(
:"4"n, :"3.95"n, :"3.9"n, :"3.85"n, :"3.8"n, :"3.75"n, :"3.7"n, :"3.65"n,
:"3.6"n, :"3.55"n, :"3.5"n, :"3.45"n, :"3.4"n, :"3.35"n, :"3.3"n, :"3.25"n,
:"3.2"n, :"3.15"n, :"3.1"n, :"3.05"n, :"3"n, :"2.95"n, :"2.9"n, :"2.85"n,
:"2.8"n, :"2.75"n, :"2.7"n, :"2.65"n, :"2.6"n, :"2.55"n, :"2.5"n, :"2.45"n,
:"2.4"n, :"2.35"n, :"2.3"n, :"2.25"n, :"2.2"n, :"2.15"n, :"2.1"n, :"2.05"n,
:"2"n, :"1.95"n, :"1.9"n, :"1.85"n, :"1.8"n, :"1.75"n, :"1.7"n, :"1.65"n,
:"1.6"n, :"1.55"n, :"1.5"n, :"1.45"n, :"1.4"n, :"1.35"n, :"1.3"n, :"1.25"n,
:"1.2"n, :"1.15"n, :"1.1"n, :"1.05"n, :"1"n, :"0.95"n, :"0.9"n, :"0.85"n,
:"0.8"n, :"0.75"n, :"0.7"n, :"0.65"n, :"0.6"n, :"0.55"n, :"0.5"n, :"0.45"n,
:"0.4"n, :"0.35"n, :"0.3"n, :"0.25"n, :"0.2"n, :"0.15"n,
:"0.0999999999999996"n, :"0.0499999999999998"n, :"0"n,
:"-0.0499999999999998"n, :"-0.100000000000001"n, :"-0.15"n, :"-0.2"n,
:"-0.25"n, :"-0.3"n, :"-0.350000000000001"n, :"-0.4"n, :"-0.45"n, :"-0.5"n,
:"-0.55"n, :"-0.600000000000001"n, :"-0.65"n, :"-0.7"n, :"-0.75"n,
:"-0.800000000000001"n, :"-0.850000000000001"n, :"-0.9"n, :"-0.95"n, :"-1"n
),
Source Label Column( "X input" ),
Stacked Data Column( "Y output" ),
Output Table( "XXXXX_ROW1_IV-1-Stacked 6.jmp" )
)