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    <field name="TEXT">The opacity should be in the range [0, 1]</field>
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        <value name="opacity">
          <block type="math_number">
            <field name="NUM">0.5</field>
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            <value name="color">
              <block type="colour_picker">
                <field name="COLOUR">#00ffff</field>
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                  <block type="math_number">
                    <field name="NUM">0</field>
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                    <field name="NUM">0</field>
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                <value name="radius">
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                    <field name="NUM">5</field>
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                    <value name="color">
                      <block type="colour_picker">
                        <field name="COLOUR">#ff0000</field>
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                            <field name="NUM">2.5</field>
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                            <field name="NUM">0</field>
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