January 15 (Reuters) - The mainstream spot quotation range for xylene in East China is 5,780-5,800 yuan/ton, down 30 yuan/ton from the previous trading day. It is expected that the market prices of toluene and xylene will fluctuate mainly during the day, with relatively optimistic market sentiment. The domestic spot supply pressure of toluene and xylene is not high, but the actual downstream demand is average, limiting the upside potential.