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    <!-- Chemical element -->
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    <boiling>610</boiling>
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    <boiling>3500+/-300</boiling>
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    <y_pos>7</y_pos>
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    <y_pos>7</y_pos>
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    <x_pos>13</x_pos>
    <y_pos>7</y_pos>
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    <boiling>1085+/-50</boiling>
    <melting>708.5+/-71.5</melting>
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    <boiling>883</boiling>
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    <boiling>350+/-30</boiling>
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    <y_pos>7</y_pos>
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</QALCULATE>
