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how to hide column header in apex code for visualforce email template for opportunity if the column has no value for value it works- but in header how can i reference it

how to hide column header in apex code for visualforce email template for opportunity if the column has no value

for value it works-

                  <apex:outputPanel layout="none" rendered="{!NOT(ISNULL(lineItem.Discount_Applied__c))}">
                             <td>
                                {!lineItem.Discount_Applied__c}
                            </td>                 
                            </apex:outputPanel>  

but in header how can i reference it