Settings=
{
    Name = "Line Disappears",
    Param1 = 1,
    Param2 = 0.005, --используется в расчёте
    Param3 = "val 3",
    line =
    {
        {
            Name = "line 1",
            Color = RGB(255, 0, 0),
            Type = TYPE_LINE,
            Width = 1
        },
        {
            Name = "line 2",
            Color = RGB(0, 0, 255),
            Type = TYPE_LINE,
            Width = 1
        }
    }
}

function line_check(s)
   local line = Settings.line
   if (line == nil) then
      message(s .. ": " .. "line is nil")
   else
      message(s .. ": " .. "line is NOT nil")
   end
end

k1 = 0
k2 = 0

function update_k()
   k1 = 1 - Settings.Param2
   k2 = 1 + Settings.Param2
end

function Init()
   line_check("Init")
   update_k()
   return 2
end

function OnChangeSettings()
   line_check("OnChangeSettings")
   update_k()
end


function OnCalculate(i)
   if (i==1) then
      line_check("OnCalculate(index==1)")
   end
   local c = C(i)
   if (c ~= nil) then
      return c*k1, c*k2
   end
end