my @x_values_for_points_above_the_trend_line;
my @y_values_for_points_above_the_trend_line;
my @distances_above_the_trend_line;

my @x_values_for_points_below_the_trend_line;
my @y_values_for_points_below_the_trend_line;
my @distances_below_the_trend_line;

my @x_values_for_points_on_the_trend_line;
my @y_values_for_points_on_the_trend_line;

# The contents of these arrays have corresponding values in the same array positions.