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Background noise and odd peaks are present underneath the main sequence peaks, along with “N” dispersed in the sequence. Low raw signal.
The most common cause for this is that the low signal above background is due to an insuficient template or primer input or an inefficient sequencing reaction for enzyme inhibition. A typical example is ethanol contamination in the template preparation.
Quantify properly template and primer; be sure you don´t have ethanol carry over from the purification columns.