How can I make the line smooth?

Dear all; I have data vector [1 500] and I am trying to plot it. when I make zoom from 350 to 500, showed me the line as stairs . How can I make it as smooth line? data=[0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 0.238537120000000 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Answer 1

[skysky2000]

this is the picture of my zoom figure

Answer 2

[skysky2000]